单项选择题


A．until
B．once
C．after
D．since
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单项选择题
A．himB．theirsC．itD．them
A．him
B．theirs
C．it
D．them
单项选择题
A．aren'tB．weren'tC．isn'tD．wasn't
A．aren't
B．weren't
C．isn't
D．wasn't
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