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 |
C解析:
略
略
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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 |