问题

Robert is indeed a wise man.— Oh, yes. How often I have regretted ____ his advice.[ ]

A: to take
B: taking
C: not to take
D: not taking

正确答案是：

同类题型

Do you find this Maths problem_________—Yes. I can work it out_______.

What is this — It’s a ______.

The boy doesn’t know the answer _________ the teacher’squestion.

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you sure you won’t have another cup of coffee—Okay,