问题

He devoted most of his time to researching into space, believing his hard work would ______ sooner or later.

A:pay back
B:pay for
C:pay off
D:pay up

正确答案是：

同类题型

下列各句中,没有语病的一项是( )

The robber was caught by two men ______police uniform _________.

I _____ ask him, because I think I _____ be wrong. [ ]

The passengers were ________in the traffic congestion which resulted from the accident ahead.

e heard the news , hestared at me ________