问题
选择题
How long did it take the vet _______ injections to all the chickens? [ ]
A. to give
B. giving
C. he gives
D. gave
答案
答案：A
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How long did it take the vet _______ injections to all the chickens? [ ]
A. to give
B. giving
C. he gives
D. gave
答案：A