单项选择题

（）in 1943 （）the harmful smog made its appearance in Los Angeles.

A．Only/that
B．It was/then
C．That it was/when
D．It was/that

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单项选择题
Even if there are more job opporunities in some countries, I dont think the crime rate will （）

A．reduce
B．fall
C．decrease
D．descend
单项选择题
There is no point （）the piano, unless you practice every day.

A．to learn to play
B．in learning to play
C．by learning to play
D．having learned to play
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