【題目】- 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

【答案】D
【解析】句意：——今天早上我在辦公室看見了David。你知道他為什么在那兒？ ——他去那兒是為了交作業(yè)。how怎樣；whether是否；when什么時(shí)候；why為什么；根據(jù)答語(yǔ)He went there to hand in his homework可知上句是詢問原因, 用why引導(dǎo)；故選D。

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