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问题: 请教一道题

What they’ve done __________ useful to us. What he says and what he does _________agree.
A. is , not B. is, do not C. are , does not D. are , not
我认为这道题目没有答案,我们同学说答案是B,依我看,如果答案是is ,doesn't 才对,请高手指点! 因为我认为"他的言行"应该看作是整体,所以作主语应该用单数.

解答:

What he says and what he does 是指他所说的和他所做的,是两个部分,动词应用复数形式. 但是,例如:When and where hasn't been decided yet.when and where就可以看成是一个统一整体.
我觉得英语有时候就是这样,有些问题没必要很明白,只要脑子里有些印象就可以了