[請益] To V 與 ving開頭 如何分辨?

[A1right (不要問我從哪裡來)]

請問To V 或 Ving開頭的主詞要怎麼辨認...??

ex: ______ payment for late bills is exhausting and frustrating,

      especially for small or new businesses that rely on each and evey

      cent in order to keep their doors open.

       (A) Request
       (B) Requesting
       (C) To request
       (D) Must request

BC 感覺都可以阿

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推 jorry111111: 我覺得是B
→ jorry111111: 賴世雄老師是如此說：
→ jorry111111:  https://i.imgur.com/1LGuC6Q.jpg
→ jorry111111:  https://i.imgur.com/XYCHSlx.jpg
→ A1right: 感恩感恩