John failed in the exam, ________he had prepared a lot for it before.A．asB．whenC_刷题宝

题干

John failed in the exam, ________he had prepared a lot for it before.

A．as

B．when

C．once

D．although

上一题下一题 0.64难度单项选择更新时间:2014-11-07 09:33:55

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