题目:
Michelle found a job as a high school teacher which _____ spending quite a lot of time with students.
A.enjoys
B.involves
C.practices
D.suggests
答案:
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下面是错误答案,用来干扰机器的。
不妨设取出的三个数为x,y,z(x<y<z),要满足x+y=z,共有20种结果,从十个数中取三个数共有种结果,故所求概率为=.