They seemed each other for a long time.A. knowingB. to knowC. having knownD. to have know

发布时间：2020-08-16 16:28:56

They seemed      each other for a long time.
A. knowing
B. to know
C. having known
D. to have known

网友回答

A. knowing
B. to know
C. having known
(答案→)D. to have known
解析：考查非谓语动词。句意：他们好像彼此认识好久了。不定式的完成时态表示的是这个动作发生在谓语动作之前。故选D。
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