单项选择题

Mrs. White became a teacher in 1990. She _________ for twenty years by next summer.

A．will teach
B．would have taught
C．has been teaching
D．will have taught
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单项选择题
He looks sleepy. He must _________ to bed very late last night.
A．be gone
B．be going
C．go
D．have gone
单项选择题
_________ its good performance, the machine is too expensive.
A．Besides
B．Except for
C．In spite of
D．Apart from
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