---How shall we go to Hainan for our holidays, by train or by air?--- A.I don’t
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---How shall we go to Hainan for our holidays, by train or by air?
---________
A.I don’t know．
B.It’s up to you．
C.Don’t you think so?
D.Oh, I’m sorry．
试题答案
B
It’s up to you．“由你决定”。