单项选择题

It is nice to go for a walk ______ a summer evening.

A．on
B．during
C．in
D．at
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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
单项选择题
We agreed to his suggestion that a bridge ______ across the river.
A．be built
B．was built
C．should build
D．would be built
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