【題目】— 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

【答案】B

【解析】

試題分析：考查情態(tài)動(dòng)詞。A. may not have been表示過去或許不會(huì)已經(jīng)---；B. couldn’t have been表示過去不可能已經(jīng)---；C. mustn’t have been表示禁止；D. needn’t have been表示過去本不必---。上句：據(jù)說他們彼此很熟悉。下句：但是他們不可能已經(jīng)很熟悉。他們只是在幾小時(shí)前剛被介紹的。故選B。

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