I do believe that swim across the river but in that situation I do that.A. am able;

问题补充：

I do believe that swim across the river, but, in that situation, I do that.

A. am able; couldn’t

B. could; was able to

C. was quite able to; couldn’t

D. couldn’t was able to

答案：

A. am able; couldn’t

B. could; was able to

(答案→)C. was quite able to; couldn’t

D. couldn’t was able to

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