Question

The problem with being a time waster is _____the online game playing often spills over into the periods of time that should be productive.

A．what

B．which

C．that

D．whether

Answer 1

C

本题考查名词性从句。句中that引导表语从句，在从句中不作任何成分，但在表语从句中不可以省略，故选C。