单项选择题

The subject ______ we are going to turn is about English studies.

A．about which
B．with which
C．about that
D．to which
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The day breaks, ______ the birds are singing.
A．because
B．as
C．since
D．for
单项选择题
Students should be encouraged to use ______ Internet as ______ resource.
A．不填; a
B．不填; the
C．the; the
D．the; a
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