In my opinion, you’d better eat and sleep more ______ lose any more weight.

A.so as to

B.in order not to

C.to not

D.so that not to

答案及解析： B

解析：

本题的含义是你最好多吃多睡以至于不会减轻体重，in order not to do表示以至于不做某事，故本题选B。