单项选择题

Greater knowledge of the universe could ______ important changes in the outer space traveling.

A．take back
B．break out
C．bring about
D．keep out
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单项选择题
It was a toy plane ______ John bought for his son yesterday.
A．what
B．who
C．that
D．why
单项选择题
The music was so ______ that the audience were ______ to death.
A．boring; bored
B．bored; boring
C．bored; bored
D．boring; boring
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