单项选择题

______ he will come or not is unknown.

A．If
B．Whether
C．That
D．What
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单项选择题
As we know, physics () the science of energy.

A. was
B. were
C. is
D. are
单项选择题
I ______ with all the windows closed, but now I'd like some fresh air.
A．am used to sleep
B．am used to sleeping
C．used to sleeping
D．used to sleep
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