________, it began to rain unexpectedly.


  1. A.
    While cleaning the machine
  2. B.
    To clean the machine
  3. C.
    He was cleaning the machine
  4. D.
    While he was cleaning the machine
D
解析：

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，因為要使用非謂語動詞做狀語，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。
考點：考查句子結(jié)構(gòu)
點評：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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