On a rainy day I was riding my bike to pick up my son ___ a terrible accident happened ahead.
A．whoB．whichC．whileD．when
D

試題分析：考查固定句式。固定句式：be doing sth when…正在做某事，在這時發(fā)生了意料之外的事情。句意：在一個雨天，我正在騎車接我的兒子在這時前面一起可怕的事故發(fā)生了。故D項正確。
點評：固定句式：be doing sth when…正在做某事，在這時發(fā)生了意料之外的事情。這里的when是一個并列連詞，后面的句子表示的是意料之外的事情。
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