22. The computer programs are a puzzle to me. The more I think of them the more questions

问题补充：

22. The computer programs are a puzzle to me. The more I think of them, the more questions I think of.

A. ask

B. asked

C. being asked

D. to ask

答案：

A. ask

B. asked

C. being asked

(答案→)D. to ask

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