many children like sugar I think they had better try not to eat it too often.A. BecauseB.

问题补充：

many children like sugar, I think they had better try not to eat it too often.

A. Because

B. When

C. Although

D. If

答案：

A. Because

B. When

(答案→)C. Although

D. If

解析：四个选项分别表示因为、当……时候、尽管和如果，选项C最符合题意，尽管许多孩子喜欢糖，我认为他们最好努力不要经常吃。