nafiul9090 wrote:Unlike the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries, a permanently orbiting space station will have to generate its own electricity.

A. the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries
B. the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their short flights
C. the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient enough power in fuel cells and batteries
D. the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights
E. the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient power in fuel cells and batteries

nafiul9090 wrote:Unlike the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries, a permanently orbiting space station will have to generate its own electricity.
A. the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries
B. the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their short flights
C. the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient
enough power in fuel cells and batteries
D. the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells
and batteries for their short flights
E. the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient power in fuel cells and batteries

nafiul9090 wrote:Unlike the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel
cells and batteries, a permanently orbiting space station will have to generate its own electricity.
A. the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells
and batteries
B. the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their
short flights
C. the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient
enough power in fuel cells and batteries
D. the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells
and batteries for their short flights
E. the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient
power in fuel cells and batteries

VivianKerr wrote:Sameer's got it. This is a Comparison question.

Keep in mind that since "a permanently orbiting space station" is NOT underlined, we have to change the comparison at the front of the sentence.

"A space station" can only logically be compared to other similar noun, like the "shuttle and earlier spacecraft."

We CANNOT compare "a space station" to "flights." That is why A, C, and E are eliminated. Since B has a comma before the "with" it separates it into a new clause, so we'd need a verb to link the description to the spacecraft.