问题

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

正确答案是：

同类题型

Let’s go for a picnic next Sunday. —Sorry, I can’t. I have to look ____________my petparrot.

When a policeman holding a gun came ,the bad man quickly .

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27Education reform，the Chinese government attaches great importance，has attracted a lot of public attention

______ the weather there— It’s windy.