题目内容

He tried to quit smoking, ____ he found impossible.

A. as
B. where
C. which
D. when

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The reason ____ I am calling you is to tell you a meeting on tomorrow morning.

A. because
B. why
C. as
D. which

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青铜器作为中国古代社会文明的标志性成就始于()。

春秋末期的《》是中国第一部手工业专著。

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