_________ there are certainly times when giving up trying is the right thing to

题型：不详难度：来源：

_________ there are certainly times when giving up trying is the right thing to do, in most cases all needed is commitment and communication.

A．Unless

B．Before

C．Although

D．Since

答案

C

解析

试题分析：句意：虽然有一定的时候放弃尝试是正确的事情,在大多数情况下都需要的是承诺和沟通。这两句话是转折关系，用although“虽然”，A. Unless除非，如果不，B. Before  在…前面， D. Since自从，所以选C。