【題目】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】B

【解析】在so…that…結(jié)構(gòu)中，當把so及所修飾的詞一起置于句首時，主句要用倒裝，排除A、C兩項；根據(jù)后面的decided可知用一般過去時。

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