I must find out why＿＿＿＿so many students made the same mistake. A．is it thatB．was_刷题宝

题干

I must find out why＿＿＿＿so many students made the same mistake.

A．is it that

B．was it which

C．it is what

D．it was that

上一题下一题 0.64难度单项选择更新时间:2013-11-07 02:10:53

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