Nowadavs most people in order to keep fit prefer walking to driving necessary.A. ifB. unle

问题补充：

Nowadavs,most people,in order to keep fit,prefer walking to driving necessary.

A. if

B. unless

C. in case

D. as if

答案：

A. if

(答案→)B. unless

C. in case

D. as if

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