Question

---Your classroom report is so wonderful.
---I wrote for 3 hours ___________ I finished it.

A．when

B．if

C．before

D．after

Answer 1

C

考查从句的连接词。“你的课堂报告很精彩。”“我花了3小时完成它的。”A“当”；B“如果”；C“在......之前”；D“在......之后”。故选C。