单项选择题

I don’t skate now，but I used______ when 1 was a kid．

A．to
B．to do
C．to it
D．to doing it
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单项选择题
If you smoke in a non-smoking section, people ______
A. have objected


B. objected
C. must object


D. will object
单项选择题
The earthquake ______ not have come at a worse time for the war-torn country.
A. could
B. must

C. might
D. should
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