It is known to all that you exercise regularly you won’t stay healthy.A. becauseB. unles

问题补充：

It is known to all that you exercise regularly, you won’t stay healthy.

A. because

B. unless

C. now that

D. in case

答案：

A. because

(答案→)B. unless

C. now that

D. in case

解析：连词辨析。A因为；B除非，如果..不；C既然；D以防；句意：众所周知，如果你不经常锻炼，你就不会保持健康。故B正确。