Proper exercise is good for your health._____, too much is bad for it.
A. Therefore B. But C.However D. while
Proper exercise is good for your health._____, too much is bad for it.
A. Therefore B. But C.However D. while
C
考查副词的用法。由空格后的逗号看出,此处需要一个副词,依据句意表转折,故选C;but和while都是连词。