Only after I read the text over again its main idea.A. that I knewB. did I knewC. 1 could

问题补充：

Only after I read the text over again its main idea.

A. that I knew

B. did I knew

C. 1 could know

D. I did know

答案：

A. that I knew

(答案→)B. did I knew

C. 1 could know

D. I did know

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