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

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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