单项选择题

The operator pressed the switch and the lights ______ on.

A. would come
B. came
C. were coming
D. had come
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单项选择题
______ the 8:20 bus because he didn’t leave home till 8:25.
A. couldn’t have caught
B. shouldn’t have caught
C. ought to have caught
D. must not have caught
单项选择题
I should very much like to go to the party, but ______.
A. I am not invited
B. I have not been invited
C. I was not invited
D. I will not be invited
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