题目内容
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
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题目内容
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