the Blacks have been concerned about their only son's safety since he___hiking alone the other day.
问题描述：
the Blacks have been concerned about their only son's safety since he___hiking alone the other day.
A.went B.has gone 为什么选A不选B
答
the other day 是前两天,所以前文应该是过去式 而非完成时.
所以选went