The number of workers 2000.
A. has reached
B. have reached
C. is reached
D. has reached to
网友回答
(答案→)A. has reached
B. have reached
C. is reached
D. has reached to
解析：考查主谓一致。本句的主语是the number of..意为：…的数量；做主语的时候谓语动词用单数形式。Reach是及物动词，后面直接加宾语。句意：工人的数量达到了2000.根据句意说明A正确。