请问To V 或 Ving开头的主词要怎么辨认...??
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 感觉都可以阿