单项选择题

There was a second knock at the door. It was the second time I () that afternoon.

A. was interrupted
B. was interrupting
C. had interrupted
D. had been interrupted

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单项选择题
—()the woman there be our English teacher —She() be, but I' m not sure.

A. May... mustn't
B. Can... may
C. Can... can't
D. Must... needn't
单项选择题
If you keep on, you' ll succeed ().

A. in time
B. at one time
C. at the same time
D. on time
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