I can't get through to the general manager's office anyhow.

I can't get through to the general manager's office anyhow.
The line is busy.Someone____the telephone.
A.must use B.uses C.must have been using D.must be using
这里的Someone应该是主动的,那为什么答案是D呢?

红辣椒7758521 1年前已收到2个回答举报

yu596223468 幼苗

共回答了15个问题采纳率：93.3% 举报

这里的must be using并不是被动语态,而是推测某人在某个时间一定正在做某事,因为must是情态动词,后面跟动词原形,所以is using就要变成be using

1年前

睡神希泊幼苗

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D.是现在进行时

1年前

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你能帮帮他们吗

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