【题目】Everyone in the village is very friendly. It doesn't matter ___ you have lived there for a short or a long time.
A.why
B.how
C.whether
D.When

【答案】C
【解析】句意：村子里的每个人都很友好。你在那里住的时间长短都无所谓。A. why“为什么”；B. how “怎样”；C. whether“是否”；D. When“当…..时候”。it是形式主语，whether引导的是真正的主语从句，所以选C。