题目内容

19.-David,turn off your computer now!You                    play on it too long.
-I see,mum.(  )
A.couldn'tB.mustn'tC.wouldn't

分析 --戴维,现在关掉你的电脑!你不可以玩太久.
--我知道了,妈妈.

解答 答案:B.
根据David,turn off your computer now!You                    play on it too long.可知戴维,现在关掉你的电脑!你不可以玩太久,这里表示禁止做某事,应该用mustn't.故选B.

点评 本题考查了情态动词的用法.解答时注意了解句意以及所给选项的意思并作出正确选择.

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