If you feel tired and sick of fat food, that is you have to go to the hospital for a medical examination.
A. why
B. when
C. whether
D. what
网友回答
A. why
(答案→)B. when
C. whether
D. what
解析：本题考查表语从句引导词的用法。本句话的意思为“如果你对油腻的食品感到厌恶，那是你该去医院接受检查的时候了”。句型That’s when...表示“那是该做……的时候了”。