题目内容
Mr. Green _______ his lessons when I went into his office.
| A．prepares | B．prepared |
| C．is preparing | D．was preparing |
D
解析试题分析：句意：格林老师在我走进他办公室时他正在备课。when从句中用的是一般过去时态，所以根据句意主句应用过去进行时态，故选D。
考点：考查动词时态
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