be
don't perform
will do
An operation may ___(be) necessary.Doctors ___(not perform) operations; surgeons ___ (do).
An operation may ___(be) necessary.Doctors ___(not perform) operations; surgeons ___ (do).
用括号内单词正确时态填空,
用括号内单词正确时态填空,
英语人气：637 ℃时间：2020-05-25 03:26:55
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