题目内容

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 foundD.have I found
B
以so+adj./adv.开头的句子要在主句中进行部分倒装。句意:我发现这个问题是那么的难,就问了汤姆。
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