关于完成时态的使用

小目标750

A recent court decision has qualified a 1998 ruling that workers cannot be laid off if they have been given reason to believe that their jobs will be safe, provided that their performance remains satisfactory.

A. if they have been given reason to believe that their jobs will

B. if they are given reason for believing that their jobs would still

C. having been given reason for believing that their jobs would

D. having been given reason to believe their jobs to

E. given reason to believe that their jobs will still

答案是A.

我想请问下为什么要用完成时？

希望有人能帮着分析一下， 谢谢！

wudose

因为要体现being given reason这个动作发生在cannot be laid off之前

小目标750

wudose 发表于 2018-12-9 14:53
因为要体现being given reason这个动作发生在cannot be laid off之前

同意！