【題目】—Mr. Johnson, Fm really sorry you waiting for so long a time.

—I know you are very busy at the moment.

A. to have kept B. to keep

C. to be keeping D. to have been kept

【答案】A

【解析】考查非謂語動(dòng)詞。上句：約翰遜先生，我真的很抱歉讓你等了這么長時(shí)間。下句：我知道你現(xiàn)在很忙。此處是動(dòng)詞不定式做原因狀語，非謂語動(dòng)詞keep的動(dòng)作明顯先于謂語動(dòng)詞，所以用動(dòng)詞不定式的完成式，故選A。

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