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

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

D

解析試題分析：句意為：我進到辦公室的時候，格林先生正在備課。本句表示的是過去某一時刻正在進行或發(fā)生的動作，應(yīng)用過去進行時。故選D。
考點：考查過去進行時。

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