单项选择题

______ these circumstances, you might agree with us that it is rather difficult for your products to put a footing on this market.

A．On
B．At
C．Under
D．Over
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单项选择题
It's high time that something ______ to prohibit selling fake commodities.
A．must be done
B．be done
C．was done
D．were done
单项选择题
It doesn't alter the fact that he was the man ______ for the death of the little girl.
A．accounting
B．guilty
C．responsible
D．obliged
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