单项选择题

When I got to the station the train ______ left.

A．already had
B．had already
C．has already
D．already has
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单项选择题
I cannot sleep. The dog next door is making too much noise. I wish it ______ quiet.
A．kept
B．would keep
C．had kept
D．will keep
单项选择题
It is important for everyone ______ learn English.
A．by
B．when
C．to
D．how
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