你好
选D
用doing 表示一件事的时候作主语,此时后面用is
--------- others is not easy .l think it is a kind art
--------- others is not easy .l think it is a kind art
A communicate with B communicates with C to communicate D communicating with
请说一下理由
A communicate with B communicates with C to communicate D communicating with
请说一下理由
英语人气：386 ℃时间：2020-07-04 06:29:28
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