4．-Tom isn't feeling very well．
-He seems to have a cold ________ the weather changes suddenly．（　　）
A．beforeB．soC．becauseD．if

分析 -Tom感覺不舒服．
-因為天氣的突然變化他似乎感冒了．

解答 答案：C；A before在…之前；B so所以；C because因為；D if如果；根據(jù)句意，可知"the weather changes suddenly天氣的突然變化"是"He seems to have a cold他似乎感冒了"的原因；故選C．

點評 根據(jù)句中信息推測出該句的句意是解答此題的關(guān)鍵；還要對給出的答案進行分析和比較，從而作出正確解答．

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