题目

Many teachers don’t want their students to ________ doing too much homework. A．keep busy       B．be kept busy C．keep busying    D．be kept busying     答案： B   keep的主语是their students，它们之间存在被动关系，busy为形容词作补足语。实际上该句是keep sb. busy doing sth.的被动结构。  

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