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
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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
单项选择题
Most students _____ their jobs by the end of July.
A．have found
B．will have found
C．will find
D．are going to find
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