29. It is known to us that doing eye exercises our eyes and that is to say our eyes can

问题补充：

29. It is known to us that doing eye exercises our eyes, and that is to say, our eyes can doing eye exercises.

A. benefits; benefit from

B. benefits to; benefit

C. benefits from; benefit

D. benefits; be benfited from

答案：

(答案→)A. benefits; benefit from

B. benefits to; benefit

C. benefits from; benefit

D. benefits; be benfited from

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