单项选择题

According to the schedule, the plane for Sydney _____ at eight o’clock in the evening.

A．takes off
B．is taking off
C．has taken off
D．was taking off
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单项选择题
A series of attempts _____, we came to a wonderful solution to the problem.
A．had been made
B．were made
C．having been made
D．having made
单项选择题
The company has confidence in its latest model of computer _____ low cost will make it attractive to students.
A．whose
B．its
C．which
D．that
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