摘要：17．Sam coins since he was eleven years old, and now he has hundreds of them． A．collected B．had collected C．has been collecting
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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
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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
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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 |
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
Sam ______ coins since he was eleven years old, and now he has hundreds of them.
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| A．collected | B．had collected |
| C．has been collecting | D．had been collecting |