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