单项选择题

There are thirty sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentence.
Mark your answers on your answer sheet.

It was far from being a pleasant experience, but they believe that only if they hold on to it, it will ______ sooner or later.

A.sit back
B.hold back
C.cut back
D.pay back