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(jìn)到辦公室的時(shí)候，格林先生正在備課。本句表示的是過去某一時(shí)刻正在進(jìn)行或發(fā)生的動作，應(yīng)用過去進(jìn)行時(shí)。故選D。
考點(diǎn)：考查過去進(jìn)行時(shí)。

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