问题

So difficult ____ it to work out the problem that I decided to ask Tom for advice.[ ]

A: I did find
B: did I find
C: I have found
D: have I found

正确答案是：

同类题型

To help Tom improve his English, I_______ that he takesome online courses.

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Use your head Nothing taught by others canhave the same effect on you as ______learned by yourself

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