单项选择题

It has been （） since we went out to play last time.

A．some time
B．sometime
C．sometimes
D．some times

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单项选择题
Mr. Green works in a （） building.

A．thirty stories high
B．thirty - stories high
C．thirty - story - high
D．thirty - story high
单项选择题
I don’t think the poor ______ always poor. Working hard ______ very important.
A．is; is
B．are; are
C．are; is
D．is; are
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