单项选择题

Although ________ happened in that developed country sounds like science fiction, it could oc cur elsewhere in the world.

A．which
B．what
C．how
D．it
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单项选择题
At first I thought that math problem would be rather difficult, but it ________ to be fairly easy.
A．turned out
B．turned up
C．turned on
D．turned over
单项选择题
There is an old saying which goes, Never ________ until tomorrow what you can do today.
A．put aside
B．put up
C．put off
D．put away
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