Question

--- Would you please tell me_____ the timetable (时间) has changed?
--- Because the students should have a rest at noon.
A.  if             B. when           C. why

Answer 1

C

解析试题分析：句意：请你告诉我为什么改变了作息时间？因为学生应该在中午休息。If是否；when当……的时候；why为什么。本题的答语是以because引起的从句，所以选C。
考点：考查宾语从句的引导词。