12. Relative humidity is the amount of water vapor the air contains at a certain temperature _____ with the amount it could hold at that temperature.
(A) to compare
(B) compared
(C) comparing
(D) compares
answer: B
请问这里为什么用被动? 为什么不是C?谢谢!!
举报
a certain temperature 后边是个定语从句省略形式
完整句是a certain temperature which is ……
因为a certain temperature 不能做主动,所以要用被动形式
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