Question

Friendship helps us understand       we are,       we need each other and     we can do for each other.

A．what; why; how	B．who; how; what
C．who; what; why	D．who; why; what

Answer 1

D

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。