单项选择题

People try to avoid public transportation delays by using their own cars, and this ______ creates further problems.

A．in short
B．in case
C．in doubt
D．in turn
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单项选择题
The authorities spend a lot of money ______ keeping the streets and parks clean.
A．in
B．on
C．up
D．out
单项选择题
The day ______ I shall never forget is the one ______ I joined the army.
A．that… where
B．when… in which
C．which… when
D．on which… why
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