The chemistry class _____ for five minutes when we hurried there.
A. had been on
B. was on
C. has been on
D. would be on
A. had been on
B. was on
C. has been on
D. would be on
【答案】
A. had been on
B. was on
C. has been on
D. would be on
A. had been on
B. was on
C. has been on
D. would be on
【答案】
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