问题补充:
Friendship helps us understandwe are, we need each other andwe can do for each other.
A. what; why; how
B. who; how; what
C. who; what; why
D. who; why; what
答案:
A. what; why; how
B. who; how; what
C. who; what; why
(答案→)D. who; why; what
解析:考察宾语从句。Understand后面有3个宾语从句:who we are(我们是谁;who做表语);what we need(我们需要的东西;what做need的宾语);what we can do(我们能做的;what做do的宾语);故D正确。