题目内容：

we dont think with goups very helpful
we dont think__with goups__very helpful.
Astudy,is Bstuding,is Cstuding,are D,study,are

优质解答

选 B
这里是一个宾语从句 省略了that we dont think that studing with goups is very helpful.
所以这里的studing 是非谓语的用法 ,表示主动 studing with goups是一件事情,所以用is