单项选择题

Those naughty boys were caught ______ in the river again.

A．to fish
B．fished
C．fishing
D．having fished
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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
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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