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
It is important that she () in an appropriate position.

A．placed
B．be placing
C．places
D．be placed
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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