what ( )the children of class three doing ( ) now?填do的形式

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what()thechildrenofclassthreedoing()now?填do的形式what()thechildrenofclassthreedoing()now?填do的形式what()th

what ( )the children of class three doing ( ) now?填do的形式
what ( )the children of class three doing ( ) now?填do的形式

what ( )the children of class three doing ( ) now?填do的形式
前一空格填are ,后一空格填doing是对的.完整句子为
what are the children of class three doing now?