题目内容
. ----______are they staying in Beijing?
----For three days.
----For three days.
A.How often | B.How long |
C.How old | D.How soon |
B
for three days表示的是时间段,故用how long 来提问。

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题目内容
A.How often | B.How long |
C.How old | D.How soon |