题目内容
(请给出正确答案)
[主观题]
We ______ your terms carefully but ______ to say that we cannot accept them.A.are studying
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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