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请问应选哪个答案?
9.1 helped my mum ________the housework yesterday.
A.do B.did C.clean
请问是不是要用过去式did?是不是只要help表示时态就行了?
人气:321 ℃ 时间:2020-04-12 06:43:19
解答
选择A.do ,因为help后面的动词都一定要用原型,help的其它形式也是一样的.help sb do sth:帮助某人做某事
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