Question

The students _______ busily when Miss Brown went to get a book she _______ in the office

1. A.
   had written; left
2. B.
   were writing; has left
3. C.
   had written; had left
4. D.
   were writing; had left

Answer 1

D
考查時(shí)態(tài)。句意：當(dāng)布朗小姐去取落在辦公室的書(shū)的時(shí)候，學(xué)生們正忙于寫(xiě)作業(yè)。故第一空用過(guò)去進(jìn)行時(shí)，第二空用過(guò)去完成時(shí)。選D。