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题目
题型:不详难度:来源:
He"s been collecting stamps _             he was eight years old.
A.whenB.whileC.andD.since

答案
D
解析

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
核心考点
试题【He"s been collecting stamps _             he was eight years old.A.whenB.whileC.】;主要考察你对助动词等知识点的理解。[详细]
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