it is required that every citizen ,whoever he ___,___the laws of the country

问题描述:

it is required that every citizen ,whoever he ___,___the laws of the country
A were,would obey B may be ,must obey C is ,obey D should be ,obey 但是为什么不选B呢

从后面的一空,就可以排除A,B.因为it is required that后面应该接 (should) + 动原这种虚拟语气的形式,其中should可省略.在看前面的,whoever he_____ ,这是让步状语从句,it is required that·····是主句,而这句话的时态从 it is 可以判断出是一般现在时,而he是第三人称单数,所以选is,C