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：發(fā)現(xiàn)解決這個問題如此困難，所以我答應向湯姆咨詢一下。So位于句首，應使用部分倒裝。另外本句用過去時態(tài)。
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