D to reply
形式主语 It is +形容词+to+动词原形
answer是及物动词可以直接 answer question
It is polite ______ to other people's question.
It is polite ______ to other people's question.
A.answer.B.to answer.C.reply.D.to reply
为什么不能选B？
A.answer.B.to answer.C.reply.D.to reply
为什么不能选B？
英语人气：881 ℃时间：2020-02-15 08:50:53
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