The article suggests that when a person under unusual stress he should be especially careful to have a well-balanced diet.
A. is
B. were
C. be
D. was
网友回答
(答案→)A. is
B. were
C. be
D. was
解析：动词时态题。suggest后接宾语从句时,如果suggest意为“建议”,宾语从句的谓语动词应用虚拟语气:should+动词原形或用动词原形。但是本题suggest引导的宾语从句中,主句是he should be...,用的是should+动词原形的形式,而空格处需要填入的是when引导的时间状语从句中的动词,所以不必用虚拟语气。而且从句说的是一般规律性事情,用动词的一般现在时就行了。