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—What _________ to the young tree yesterday?
—Its leaves falled.

A. happen
B. happens
C. happened
D. happening
C
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科目:小學(xué)英語 來源:期末題 題型:單選題

— What _____________ to the young tree yesterday?
— Its leaves falled.
[     ]
A. happen
B. happens
C. happened
D. happening

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