单项选择题

As it turned out to be a problem of no importance, we______ so much time looking into it.

A．needn't spend
B．didn't have to spend
C．oughtn't to spend
D．needn't have spent
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单项选择题
Radio Star, ______ by the English Department, is very popular with the students.
A．built
B．founded
C．kept
D．found
单项选择题
Several passages were found ______ when the book______ me.
A．missing; returned
B．lost; was returned
C．gone; was returned to
D．disappeared; was returned to
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