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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单项选择题
This is the only part of the country ______ this type of pottery can be found.
A．that
B．which
C．where
D．what
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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