问题

The students ___ busily when Miss Brown went to get a book she ___in the office
A:might have saved
B:must have saved
C:should have saved
D:could have saved
B:must have saved
C:should have saved
D:could have saved
正确答案是:
同类题型
Seeing the ________ sight, the little girl was nearly ________ to death. [ ]
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rry, but there’s no smoking room in this section on the train—Oh, I____that, and I won’t smoke again