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  3. The secret agent kept looking back because he was afraid of ______.

The secret agent kept looking back because he was afraid of ______.

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问题 The secret agent kept looking back because he was afraid of ______.
选项 A、followed
B、being followed
C、having followed
D、having been followed
答案B
解析 of是介词，其后接动名词。由于follow和主语he是被动关系，所以用动名词的被动式。D项是动名词的完成被动式，表示此动作与主语是被动关系且先于谓语动作发生，不符合本题题意。
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