When I said hello to him,he pretended not (recognize) me at first.

问题描述:

When I said hello to him,he pretended not (recognize) me at first.

When I said hello to him, he pretended not to recognize me at first.
pretend后面加不定式to,固定用法.
pretend to do是强调假装要做某事.
当我向他打招呼的时候,他起初假装不认识我.