he insisted that he ___to tibet

问题描述:

he insisted that he ___to tibet
A:was sent
B:should be sent
C:sent
D:should send
我想问为什么选B不选C
虚拟语气不是should可省略吗?为什么会选B呢?
能回答的太感谢了!

he insisted that he should be sent to tibet
他坚持认为他应该向*
he insisted that he sent to tibet
他坚持说,他送到*
意思自己看吧,