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為so…that…結構。按英語語法，當該結構的so…置于句首時，其后的句子(主句)要用倒裝語序，如：So loudly did he speak that even people in the next room could hear him. 他講話聲音那么大，隔壁屋里的人都聽得見。
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