Mr. Green his lessons when I went into his office.A．prepares B．prepared C．is preparing D．was preparing 题目和参考答案——青夏教育精英家教网—

Mr. Green his lessons when I went into his office.

A．prepares	B．prepared
C．is preparing	D．was preparing

解析试题分析：句意为：我进到办公室的时候，格林先生正在备课。本句表示的是过去某一时刻正在进行或发生的动作，应用过去进行时。故选D。
考点：考查过去进行时。

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