[國中] 關於notice的用法

[yhcsomewhere (迷途小羔羊)]

(    )1. I didn't notice her ____ into my office.
      A. has come  B.came  C.come   D.to come
                                                 答案:C

(    )2. I didn't notice she ____ into my office.
      A. has come  B.came  C.come   D. coming     答案 B


請問這2題要怎麼解釋較好呢?謝謝~

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→ jiunman:1.notice當感官動詞用後面接原V或Ving