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They _____ 3000 English words since three years ago.

A. learned
B. had learned
C. will learn
D. have learned
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科目：初中英語 來源：河北省模擬題 題型：單選題

They _____ 3000 English words since three years ago.
[     ]
A. learned
B. had learned
C. will learn
D. have learned

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