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Difficulty—
Scientists say that, by bathing the skin cells in extracts of immune cells, that human skin cells in a test tube are made to behave as if they were immune system cells.
A) that human skin cells in a test tube are made to behave as if they were
B) that human skin cells were to behave in a test tube as if they were
C) human skin cells in a test tube were made to behave as if
D) they have made human skin cells in a test tube that were behaving as
E) they have made human skin cells in a test tube behave as if they were
I was confused between D and E. And in option E, there are two "they"s that refer to two different antecedent.
A) that human skin cells in a test tube are made to behave as if they were
B) that human skin cells were to behave in a test tube as if they were
C) human skin cells in a test tube were made to behave as if
D) they have made human skin cells in a test tube that were behaving as
E) they have made human skin cells in a test tube behave as if they were
I was confused between D and E. And in option E, there are two "they"s that refer to two different antecedent.
