No sooner _______ the competition _______ _______ an unexpected accident happene

题干

No sooner _______ the competition _______ _______ an unexpected accident happened.

A．did … begin; than	B．had … begun; when
C．did … begin; when	D．had … begun; than

上一题下一题 0.64难度单项选择更新时间:2013-12-26 08:28:21

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