Happinessisabutterfly,which,whenpursued,isalwaysjustbey...

问题详情：

Happiness is a butterfly, which, when pursued, is always just beyond your grasp, but ________, if you will sit down quietly, may alight upon you.

A. that   B. which   C. one    D. whose

【回答】

B

知识点：定语从句

题型：选择题