The students _______ busily when Miss Brown went to get a book she _______ in the office.
A．had written; leftB．were writing; has left
C．had written; had leftD．were writing; had left
D
考查時態(tài)。句意：當(dāng)布朗小姐去取落在辦公室的書的時候，學(xué)生們正忙于寫作業(yè)。故第一空用過去進(jìn)行時，第二空用過去完成時。選D。
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