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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单项选择题
I don't know why he ______ in the middle of a sentence.
A．broke away
B．broke out
C．broke through
D．broke off
单项选择题
It is high time that such practices ______
A．are ended
B．be ended
C．were ended
D．must be ended
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