问题
选择题
His father ________ in the factory since he was twenty.
A．works
B．has worked
C．will work
D．was working
答案
答案：B
根据时间状语从句从他二十岁，可知主语为现在完成时态，选B.
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His father ________ in the factory since he was twenty.
A．works
B．has worked
C．will work
D．was working
答案：B
根据时间状语从句从他二十岁，可知主语为现在完成时态，选B.