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

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

选项 A、are studying; regret
B、have studied; are regretting
C、have studied; regret
D、have been studying ;have regretted

答案C

解析本题为语法结构题，考动词时态。study(研究)这一动作发生在 regret to say(遗憾地表示)之前，因此，regret 用现在时，相应地，study 要用现在完成时。本句大意为：我们仔细研究了你提出的条款，但是，我们很遗憾地指出我们不能接受。

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英语

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