our maths teacher has _ Australia for a week A.been to B been in 为什么选这个

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our maths teacher has _ Australia for a week A.been to B been in 为什么选这个
our maths teacher has _ Australia for a week A.been to B been in 为什么选这个

our maths teacher has _ Australia for a week A.been to B been in 为什么选这个
首先看表时间的“for a week”,表示一个时间段,说明在澳大利亚待了一周,当然要用“in",而to表动作,是“去”,和题意表达的不符.

B
A表示到,B表示持续一段时间,根据a week 故B