问题
选择题
---Your classroom report is so wonderful.
---I wrote for 3 hours ___________ I finished it.
A．when
B．if
C．before
D．after
答案
答案：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。