Let those in need that we will go all out to help them. A. to understand B. understand C.

问题补充：

Let those in need that we will go all out to help them.

A. to understand

B. understand

C. understanding

D. understood

答案：

A. to understand

(答案→)B. understand

C. understanding

D. understood

解析：let作为使役动词，后面的动词不定式不带to。这里的in need做了those的定语，understand

let的宾语those的补足语。句意：让那些需要帮助的人明白我们将全力以赴帮助他们。

【考点定位】考查非谓语动词