单项选择题


A．though
B．although
C．yet
D．but
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单项选择题
A．alsoB．tooC．as wellD．either
A．also
B．too
C．as well
D．either
单项选择题
A．there areB．they areC．there isD．it is
A．there are
B．they are
C．there is
D．it is
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