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________, it began to rain unexpectedly.
A.While cleaning the machine
B.To clean the machine
C.He was cleaning the machine
D.While he was cleaning the machine
D

试题分析:考查句子结构。后面句子的主语是it说明AB错误,因为要使用非谓语动词做状语,要求非谓语动词的逻辑主语是句子的主语。C项是一个完整的句子,逗号后面也是完整的句子,两个句子之间缺少连词连接,故C错误。句意:当他在清洁机器的时候,突然开始下起雨了。故D正确。
点评:两个句子之间必须有连词连接,如果没有连词,那么其中一个就要变成短语的形式来呈现。
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