问题
选择题
They seemed ______ each other for a long time.
A．knowing
B．to know
C．having known
D．to have known
答案
答案：D
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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They seemed ______ each other for a long time.
A．knowing
B．to know
C．having known
D．to have known
答案：D
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。