．Our teacher is very busy.He is in working out a teaching plan.A．involve B．involvingC．involved D．to involve 题目和参考答案——青夏教育精英家教网—

题目内容

．Our teacher is very busy.He is ________ in working out a teaching plan.

A．involve B．involving

C．involved D．to involve

【解析】C　[be involved in “从事，忙于”，是固定短语。]

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