Let those in need that we will go all out to help them. (2013·陕西，13)
A. to understand
B. understand
C. understanding
D. understood
网友回答
A. to understand
(答案→)B. understand
C. understanding
D. understood
解析：
句意为：要让那些需要帮助的人认识到我们会全力以赴地帮助他们。let后跟不带to的不定式。