I never seen "effort for+time " when we talk of time period. so, it is posssible that "effort for+time period " is wrong
but I am sure "effort to do" is idiom. so "effort ...that has subjected" is not idiomatic. D is wrong.
in the idiom "effort to do", the agent which cause "to do" is not present, so "to do" is correct. we do not need to show the agent of "to do".
I thing basis idiom is the topic of this offical SC question.
official questions are great.
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There's nothing that can't be solved with a quick google search, unless you live in China, in that case you might use Baidu instead of google and sina weibo instead of twitter.
https://gmatclub.com/forum/twenty-two-fe ... 12821.html
answer cited as official:E
https://www.urch.com/forums/gmat-sentenc ... -long.html
answer cited as official:E
Overall time spent fetching it: 53 seconds 32'
There's nothing that can't be solved with a quick google search, unless you live in China, in that case you might use Baidu instead of google and sina weibo instead of twitter.
https://gmatclub.com/forum/twenty-two-fe ... 12821.html
answer cited as official:E
https://www.urch.com/forums/gmat-sentenc ... -long.html
answer cited as official:E
Overall time spent fetching it: 53 seconds 32'












