They seemed ______ each other for a long time.A．knowingB．to knowC．having knownD．_刷题宝

题干

They seemed ______ each other for a long time.

A．knowing

B．to know

C．having known

D．to have known

上一题下一题 0.85难度单项选择更新时间:2011-03-18 10:43:49

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