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— I can’t get through to the general manager’s office.
—The line is busy. Someone ________ the telephone.

A.must have used B.could use C.could have used D.must be using

D

解析试题分析:通过The line is busy“线路正忙。”可知后句的意思应该是“有人一定正在用电话.”表示现在正在用。所以应该用must be using。而A.must have used表示“一定用过”B.表示可能用,不一定是此时;C.表示“可能用过”。所以本题选D。
考点:本题考查情态动词。
点评:情态动词可以表示推测的情况,could表示“可能”,must表示“一定”。当其后接have done时表示已经做过;当其后接be doing时,表示正在做;其后接原形时,表示经常如此。

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