单项选择题

______ is generally accepted, economical growth is determined by the smooth development of production.

A．What
B．That
C．it
D．As
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单项选择题
I'm sure the letter won't arrive in time ______ it is sent by air.
A．if
B．until
C．because
D．unless
单项选择题
Finally, the thief handed everything ______ he had stolen to the police.
A．which
B．what
C．whatever
D．that
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