问题
选择题
The number of workers in this factory _______ a lot this year. There were only
a few workers in it two years ago.
A．have increased
B．has increased
C．have risen
D．has booked
答案
B
考查固定搭配。The number of作主语，谓语动词用第三人称单数，故排除A和C.句意：这家工厂工人的人数今年增加了很多，两年前，仅仅有几个工人。根据句意排除D。