Question

It is known to all that ________ you exercise regularly, you won’t keep good health．

[　　]

A．

unless

B．

whenever

C．

although

D．

if

Answer 1

答案：A
解析：

根据句意进行选择，全句的意思是：众所周知，除非经常锻炼，否则就不能保持健康。