问题补充：
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：
A. have increased
(答案→)B. has increased
C. have risen
D. has booked
解析：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。
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