单项选择题

The fact remains ______ we are behind many others.

A．that
B．why
C．where
D．how
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单项选择题
It is nice to go for a walk ______ a summer evening.
A．on
B．during
C．in
D．at
单项选择题
Tom looks so pale today. He ______ ill.
A．must be
B．had to be
C．should be
D．shall be
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