题目内容
He's been collecting stamps _ he was eight years old.
A.when | B.while | C.and | D.since |
D
试题分析:句意:自从他八岁时,他已经开始收集邮票。分析主句是现在完成时,从句是时间,因此只有since符合题意。故选 D
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题目内容
A.when | B.while | C.and | D.since |