No sooner _______ the competition _______ _______ an unexpected accident happened.
A．did … begin; thanB．had … begun; when
C．did … begin; whenD．had … begun; than
D

試題分析：考查倒裝結(jié)構(gòu)與固定句式。 No sooner...than是固定短語，而且no sooner后要用過去完成時態(tài)，放在句首要部分倒裝，所以要把had提前，后面搭配than所以選D.
句意：競賽一開始意外事故就發(fā)生了。
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