.___ is our duty for us young adults to work hard at our lessons.A.That B.It C.This D.He
人气：481 ℃ 时间：2019-08-26 07:12:49
解答
B it
It 在此句中作形式主语,真正主语是后面的动词不定式复合结构for us young adults to work hard at our lessons
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