The students _______ busily when Miss Brown went to get a book she _______ in the office.　
A．had written, left　B．were writing, has left
C．had written, had left　D．were writing, had left
D。
“把書忘在辦公室”發(fā)生在“去取書”這一過去的動作之前，因此“忘了書”這一動作發(fā)生在過去的過去，用過去完成時。句中when表示的是時間的一點，表示在“同學(xué)們正忙于……”這一背景下，when所引導(dǎo)的動作發(fā)生。因此前一句應(yīng)用過去進(jìn)行時。
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