题目内容
13．-___________ I finish the homework this afternoon？-No，you needn't．It ___________ before Friday．（ ）
| A． | Can；can finish | B． | Must；must finish | ||
| C． | Must；can be finished | D． | Can；must be finished |
分析 今天下午我必须完成作业吗？--不，没有必要．你可以在星期五之前把他完成．
解答 答案：C 根据答句中有needn't，可知问句中用must（以must提问的一般疑问句，意为"…必须…吗"．肯定回答用must（必须），否定回答用needn't）．it指代homework，动词是finish，可知it是动作finish的承受者，故应用被动语态（be+done），含有情态动词时，其构成为：情态动词+be+done．故选C．
点评 本题考查含有情态动词的被动语态．掌握好其构成"情态动词+be+done"是做题的前提．情态动词的固定用法平时要多记忆多练习．
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