Friendship helps us understand we are, we need each other and we can do for each other.A.what; why; howB.who; how; whatC.who; what; whyD.who; why; what
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D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。