单项选择题

If it ______ more humid in the Desert of the Southwest, the hot temperatures would be unbearable.

A．be
B．is
C．was
D．were
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单项选择题
Mr. Smith can be quite sad ______ , though in public he is extremely cheerful.
A．by himself
B．in person
C．in private
D．as individual
单项选择题
I have made a(n) ______ for you to see the doctor at 8 o'clock tomorrow.
A．appointment
B．interview
C．opportunity
D．assignment
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