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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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
You can fly to London this evening ______ you don't mind changing planes in Paris.
A．unless
B．except
C．so far as
D．provided
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