By the time the new pupil enough courage to raise his hand, the bell for the end of the lesson
A. had gathered…was already ringing
B. was gathering…had already rung
C. gathered… had already rung
D. would gather… have rung
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(答案→)A. had gathered…was already ringing
B. was gathering…had already rung
C. gathered… had already rung
D. would gather… have rung
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