单项选择题

Without trees our world ______ a much drier place.

A．is
B．will be
C．would be
D．must be
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单项选择题
I would have gone with you, but I ______ too tired.
A．was
B．had been
C．must be
D．must have been
单项选择题
______ English, they have to study a second foreign language.
A．Except
B．Except for
C．Besides
D．Beside
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