________, 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

試題分析：考查句子結(jié)構(gòu)。后面句子的主語是it說明AB錯誤，因?yàn)橐褂梅侵^語動詞做狀語，要求非謂語動詞的邏輯主語是句子的主語。C項(xiàng)是一個完整的句子，逗號后面也是完整的句子，兩個句子之間缺少連詞連接，故C錯誤。句意：當(dāng)他在清潔機(jī)器的時候，突然開始下起雨了。故D正確。
點(diǎn)評：兩個句子之間必須有連詞連接，如果沒有連詞，那么其中一個就要變成短語的形式來呈現(xiàn)。
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