问题
选择题
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
答案
答案：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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