We never visit a friend's house without____first.Acall Bto call C calling Dcalls 给个正确答案

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We never visit a friend's house without____first.Acall Bto call C calling Dcalls 给个正确答案

We never visit a friend's house without____first.Acall Bto call C calling Dcalls 给个正确答案
We never visit a friend's house without____first.
Acall Bto call C calling Dcalls 给个正确答案

We never visit a friend's house without____first.Acall Bto call C calling Dcalls 给个正确答案
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

c without后面要接动词+ing

c