While _____ in the room, we were all very excited.

A. waited
B. waiting
C. to wait
D. wait
B
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科目:初中英語(yǔ) 來(lái)源:0103 期中題 題型:單選題

While _____ in the room, we were all very excited.
[     ]
A. waited
B. waiting
C. to wait
D. wait

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