選擇填空(每詞只用一次)

must might couldn't can't

①We ________ operate the machine last week, but we can operate it now.

②Look! The man ________ be our headmaster. I know he always comes to school this time.

③He said if he ________ ask another question.

④The boy ________ be Lin Feng. He has gone to Wuhan with his parents.

答案：
解析：

　　解答：①表示“不能；不會(huì)”，選couldn't.

　�、诒砜隙ǖ牟聹y(cè)選must.

　�、郾硎緦�(duì)過去肯定的猜測(cè)肯定，選might.

　　④表示對(duì)現(xiàn)在否定的猜測(cè)，選can't.


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