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
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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
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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