问题
选择题
20. —Why was __ you lost all your keys？
—It was because of my carelessness.
A．that
B．what
C．it that
D．One
答案
答案：C
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20. —Why was __ you lost all your keys？
—It was because of my carelessness.
A．that
B．what
C．it that
D．One
答案：C
