单项选择题

A) although C) when
B) because D) if

A．although
B．because
C．when
D．if
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单项选择题
A) will change C) changedB) has changed D) had changed
A．will change
B．has changed
C．changed
D．had changed
单项选择题
A) though C) asB) like D) as if
A．though
B．like
C．as
D．as if
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