pierre must decide what ___ next A to do B do C doing D did 选A 要怎么讲解有没有什么更专业的讲解?就这么简单?

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pierre must decide what ___ next A to do B do C doing D did 选A 要怎么讲解
有没有什么更专业的讲解?就这么简单?

表示待做的事情,用to do

what to do 固定句式

b

A (what to do =what he should do)