单项选择题

When ______ to tell the difference between British and American English, the linguist made a long and ______ speech.

A. asked, tired
B. asked, tiring
C. asking, tiring
D. be asked, tired
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单项选择题
I ______ go out today. If I do, I ______ in a storm. I said to myself when I heard the weatherman say there would be a heavy rain that day.
A. had better not to, might have been caught
B. had better, may be caught
C. would not, might have been caught
D. had better not, may be caught
单项选择题
I only called the police when I ______ everything else.
A. tried
B. was trying
C. had tried
D. had been trying
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