My sister has been working in that factory ever ______ it was set up.A since B.but C.again D.not
问题描述：
My sister has been working in that factory ever ______ it was set up.
A since
B.but
C.again
D.not
答
a
答
选A,我姐姐从它建立时开始一直在那家工厂工作.