单项选择题

It is important that she ______ in an appropriate position.

A．placed
B．be placing
C．places
D．be placed
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单项选择题
Those naughty boys were caught ______ in the river again.
A．to fish
B．fished
C．fishing
D．having fished
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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