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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 findC.I have foundD.have I found
B
句意:发现解决这个问题如此困难,所以我答应向汤姆咨询一下。So位于句首,应使用部分倒装。另外本句用过去时态。
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