单项选择题

He studies ______ science of sound.

A．×
B．the
C．an
D．a
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单项选择题
Where there is ______ will, there is ______ way.
A．the, the
B．a, a
C．a, the
D．the,a
单项选择题
We usually go swimming in ______ summer. In ______ autumn of that year, he left Wuhan for the south.
A．the, the
B．×,the
C．×,×
D．×,an
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