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问题

Mary _______ her mother with the housework, but she didn’t.

A:must have helped
B:ought to have helped
C:must help
D:should help
正确答案是:
同类题型

You’d better _______ your score and see if you have passed the exam.

class, the student leaders are on______ duty every ______ few days.

________ felt tired but quite happy after________ sports meeting.

ll the books he was interested in _______, heleft the library and went back to his dorm

have no bench to ________, so I haveto stand there ___________ TV for a while.

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