问题
选择题
Jack became seriously ill after ________ in polluted air for many years.
A．breathed
B．breath
C．breathing
D．to breathe
答案
答案：C
题目分析：句意：Jack在呼吸了很多年被污染的空气后，病的很严重。Breath与其逻辑主语Jack之间是主动关系，故用现在分词作原因状语，选C。
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