He"s been collecting stamps _ he was eight years old.A．whenB．whileC．
题型：不详难度：来源：
He"s been collecting stamps _ he was eight years old.| A．when | B．while | C．and | D．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 |
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