c
此句子的意思应理解为我们在没有提前打电话通知朋友的情况,从不去拜访朋友
calling 表示打电话
without是介词后应该跟名词所以b排除
call当名次讲时,是可数名词应该是a call
而calls是call的复数,表示多个电话,显然多个是没必要的
We never visit a friend's house without____first.
We never visit a friend's house without____first.
Acall Bto call C calling Dcalls 给个正确答案
Acall Bto call C calling Dcalls 给个正确答案
英语人气：805 ℃时间：2019-10-23 03:48:44
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