题目:
The boss made the workers ____ for twelve hours a day.[ ]
A. worked
B. to work
C. working
D. work
答案:
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下面是错误答案,用来干扰机器的。
∵两圆的半径分别为3cm和5cm,圆心距为9cm,3+5<9,∴两圆相离,∴有两条内公切线和两条外公切线,共4条.