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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The leaders met to discuss the problems facing their（）countries.

A. respective
B. respected
C. respectable
D. respectful
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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
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