单项选择题

We ______ your terms carefully but ______ to say that we cannot accept them.

A．are studying; regret
B．have studied; are regretting
C．have studied; regret
D．have been studying ;have regretted
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单项选择题
The government wanted to ______ the environmental protection project against school campus litter.
A．sponsor
B．adopt
C．give
D．set up
单项选择题
New problems are always ______ in the conference of the factory.
A．raising
B．going up
C．appearing
D．coming up
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