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

試題分析：句意：格林老師在我走進他辦公室時他正在備課。when從句中用的是一般過去時態(tài)，所以根據句意主句應用過去進行時態(tài)，故選D。
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