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

   ---- The line is busy. Someone ___________ the telephone.

   A. can have used       B. can use

   C. must have used      D. must be using

 

【答案】

D

【解析】

试题分析:考查情态动词推测的用法。A项中 can have used可能已经用了; B项中can use可以用;C项中must have used一定已经使用;D项中 must be using一定正在使用。句意:-我无论如何也无法打通总经理办公室的电话。-热线。一定有人在用电话。

考点:考查情态动词推测的用法。

点评:情态动词的用法,要掌握每个情态动词的基本用法,其它的结构都是由其基本用法变化而来。比如,A项中 can have used其实就是can“可能”加上完成时态have used“已经完成”构成。其它的类推。

 

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