So amusedthat I couldn’t help laughing when I saw the performance given by the children．A.

问题补充：

So amusedthat I couldn’t help laughing when I saw the performance given by the children．

A. I felt

B. I feel

C. did I feel

D. had I felt

答案：

A. I felt

B. I feel

(答案→)C. did I feel

D. had I felt

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