Question

【题目】- I saw David in the teachers' office this morning. Do you know ______ he was there?
- He went there to hand in his homework.
A.how
B.whether
C.when
D.why

Answer 1

【答案】D
【解析】句意：——今天早上我在办公室看见了David。你知道他为什么在那儿？ ——他去那儿是为了交作业。how怎样；whether是否；when什么时候；why为什么；根据答语He went there to hand in his homework可知上句是询问原因, 用why引导；故选D。