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看看这句英语句子有什么错误Mary must be complete her homework cat on uncle"s advise.哪里错了?

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看看这句英语句子有什么错误
Mary must be complete her homework cat on uncle's advise.
哪里错了?
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答案和解析
Mary must be complete her homework cat on uncle's advise
需要用must have completed.一定已经做好了---
must + be + done(动词的被动式)表示某件事一定是被做完了,显然mary是人,是主动做作业.
must + do sth表示必须做某事
must + have done表示一定已经作了---