I can't get though to the general manager's office anyhowThe line is busy.Someone__the phone.A.must useB.usesC.must have been usingD.must it have been是B,为什么?

问题描述:

I can't get though to the general manager's office anyhow
The line is busy.Someone__the phone.
A.must use
B.uses
C.must have been using
D.must it have been
是B,为什么?

must be using

Someone三单,动词加s

这个题目不合理撒
根本就是用排除法来做的嘛,没有考察意义!
你可以看出的,A错 太绝对
C错“已经正在用”?胡扯!
D错 简直乱套!