So difficult ____ it to work out the problem that I decided to ask Tom for advice. [ ]A. I did findB. did I findC. I have found D. have I found -高中英语-n多题

◎ 题干

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

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◎ 解析

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◎ 知识点

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