41.
(A)when 
(B)unless 
(C)while 
(D)because

but while 有儘管…，不過…的意思

In the summer, many people often decide to get fit. But 41 their motivation is correct, the methods sometimes are not. Over the years, statements like “eat less to lose weight” have been passed around as good advice.

在夏天，很多人常常決定，以得到合適的。但是，儘管他們的動機是正確的，方法有時都沒有。多年來，像“少吃減肥”已經通過了作為很好的建議。

In the summer, many people often decide to get fit. But while their motivation is correct, the methods sometimes are not. Over the years, statements like “eat less to lose weight” have been passed around as good advice.