请问这个怎么填?When passing me he pretended ______ me请问为什么填not to have seen 而不填not having seen?谢谢

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• when passing me he pretended _me 为什么要填not to have seen 而不是not to see.顺便再讲下什么时候用to do 什么时候用to have done
• 请问这个怎么填?When passing me he pretended ______ me请问为什么填not to have seen 而不填not having seen?谢谢
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