The students ______ busily when Miss Brown went to get a book she ______ in the office.
A、
were writing; has left
B、
had written; left
C、
were writing; had left
D、
had written; had left
【正确答案】
C
【答案解析】
考查时态。“把书忘在办公室”发生在“去取书”这一过去的动作之前，因此要用过去完成时。句中when表示某一时间点，某人在某一时间点做某事，用过去进行时。因此主句应该用过去进行时。故答案为C。
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