I don’t think one can keep healthy ______爱下问搜题

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问题选择题

I don’t think one can keep healthy ______ taking enough exercise. [ ]

A. with

B. without

C. for

D. to

答案

答案：B

选择题

My mother is always warning me when I go out, "Don't get off the bus ________ it is stopping."[ ]

A. until

B. before

C. while

D. after

问答题

简述产婆术的主要特点。