问题
选择题
.He tried________to persuade his friends to travel with him, so he traveled alone．
A．in store
B．in vain
C．in turn
D．in trouble
答案
答案：B
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.He tried________to persuade his friends to travel with him, so he traveled alone．
A．in store
B．in vain
C．in turn
D．in trouble
答案：B