题目内容
Sam ______ coins since he was eleven years old, and now he has hundreds of them.
A. collected B. had collected
C. has been collecting D. had been collecting
【答案】
C
【解析】 略
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相关题目
Sam ______ coins since he was eleven years old, and now he has hundreds of them.
| A．collected | B．had collected |
| C．has been collecting | D．had been collecting |