Question

【题目】— They are said to have been familiar with each other.

— But they_________. They were introduced only hours ago.

A. may not have been B. couldn’t have been

C. mustn’t have been D. needn’t have been

Answer 1

【答案】B

【解析】

试题分析：考查情态动词。A. may not have been表示过去或许不会已经---；B. couldn’t have been表示过去不可能已经---；C. mustn’t have been表示禁止；D. needn’t have been表示过去本不必---。上句：据说他们彼此很熟悉。下句：但是他们不可能已经很熟悉。他们只是在几小时前刚被介绍的。故选B。