单项选择题

Which of the following statements is INCORRECT

A．The United States is a country with varied origins.
B．My mathematics are rather shaky.
C．The Straits of Gibraltar have not lost the strategic importance.
D．One pair of scissors aren’t enough.

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单项选择题Alex would never have found out the truth if you _____ him.

A．didn’t tell
B．told
C．hadn’t told
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单项选择题We’d like to know the reason _____ she didn’t accept the job.

A．why
B．that
C．whether
D．when