Mr. Green          his lessons when I went into his office.
A．prepares B．prepared
C．is preparing D．was preparing
D

試題分析：句意為：我進(jìn)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(jìn)行或發(fā)生的動作，應(yīng)用過去進(jìn)行時。故選D。
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