单项选择题

She found the job very tough.（）she stayed at the company and was finally promoted.

A. And
B. Although
C. However
D. Until

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单项选择题
Professor Liu（）for 20 years by the end of next summer.

A. has taught
B. will be teaching
C. has been teaching
D. will have taught
单项选择题
The prisoner（）this way, for here are his footprints.

A. should have escaped
B. should escape
C. must have escaped
D. must escape
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