单项选择题

Alice was about to（）, when she suddenly found an answer to the question.

A. make up
B. look up
C. turn up
D. give up

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单项选择题

When we don't know the different ways languages are used in different cultures, we（）make serious mistakes.

A. shall
B. must
C. could
D. should

单项选择题

John and Sue（）computer games for hours before their parents came home from work.

A. are playing
B. have been playing
C. played
D. had been playing

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