单项选择题

______you understand this rule, you’ll have no further difficulty.

[A] Once
B. Unless
C. Only
D. Until
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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
单项选择题
I wish that she ______ this afternoon.
A. will come
B. can come
C. would come
D. should come
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