单项选择题

We keep in touch with them by ______ telephone.

A．the
B．×
C．a
D．an
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单项选择题
--Wheres Jack--I think he is still in __ bed, but he might just in ______ bathroom.

A．×,×
B．the, the
C．the,×
D．×,the
单项选择题
He studies ______ science of sound.
A．×
B．the
C．an
D．a
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