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：格林老師在我走進(jìn)他辦公室時(shí)他正在備課。when從句中用的是一般過去時(shí)態(tài)，所以根據(jù)句意主句應(yīng)用過去進(jìn)行時(shí)態(tài)，故選D。
考點(diǎn)：考查動(dòng)詞時(shí)態(tài)

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