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英语 填入介词填入介词1.Can you be certain _______ the time of the meet

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英语 填入介词
填入介词
1.Can you be certain _______ the time of the meeting.
2.There was no one in the streets ________ the policemen ______ duty.
3.Now I have the key ______ the whole diffculty.
英语 填入介词填入介词1.Can you be certain _______ the time of the meet
1.of
be certain of + n.对 很确定
2.except on
on duty执勤 固定搭配
3.to
key to (door,difficulty)固定搭配
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