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
______ being late made the boss angry.
A．Him
B．His
C．He's
D．For him
单项选择题
Areas where students have particular difficulty have been treated ______ particular care.
A．by
B．in
C．under
D．with
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