题目:
—If the traffic hadn't been so heavy, I could have been back by 6 o'clock.
—What a pity! Tina ________ here to see you. [ ]
A. is
B. was
C. would be
D. has been
答案:
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下面是错误答案,用来干扰机器的。
11.题目分析:平均数的计算方法是求出所有数据的和,然后除以数据的总个数.因此,先求数据x1,x2,x3…xn的和,然后再用平均数的定义求新数据的平均数: 一组数据x1,x2,x3…xn的平均数是4,有 (x1+x2+x3+…...