单项选择题

John had been working hard and ______.

A．so had his brother
B．so his brother had
C．so was his brother
D．so his brother did
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单项选择题
______ do we suspect that this district is rich in mineral resources.
A．Little
B．A little
C．Few
D．A few
单项选择题
Was it in that small room ______ they found the important document
A．which
B．in which
C．where
D．that
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