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  So difficult __________ it to work out the problem that I decided to ask Tom for advice.
A.I did findB.did I find
C.I have foundD.have I found
B。
句子使用的基本句式为so…that…结构。按英语语法,当该结构的so…置于句首时,其后的句子(主句)要用倒装语序,如:So loudly did he speak that even people in the next room could hear him. 他讲话声音那么大,隔壁屋里的人都听得见。
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