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单项选择题

The notice was written in several languages ______ foreign tourists should misunderstand it.

A. so that
B. lest
C. if
D. otherwise
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单项选择题Had he worked harder, he ______ the exams.

A. must have got through
B. could get through
C. would get through
D. would have got through

单项选择题______ did I have any idea what a real man-made satellite looks like.

A. Until quite recently
B. It was quite recently
C. Not was it quite recently
D. Not until quite recently