问题描述:
Many kinds of work ________ done by computers.
A.has B.has been C.have been D.was 答案给的是C work不是不可数名词吗为什么还要用复数啊?
A.has B.has been C.have been D.was 答案给的是C work不是不可数名词吗为什么还要用复数啊?
问题解答:
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