Tom is not good at maths.He ------------ study it hard.

问题描述:

Tom is not good at maths.He ____________ study it hard.
1个回答 分类:英语 2014-11-24

问题解答:

我来补答
should 应该
再问: A. can B. is C. have to D. has to 四选一
再答: D 不得不(主语第三人称单数用has to)
 
 
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