Mother insisted that__ .A they are to be back before nine in the evening.B they ought to be back before nine in the evening.C they be back before nine in the evening.D they had to be back before nine in the evening.

Mother insisted that__ .A they are to be back before nine in the evening.B they ought to be back before nine in the evening.C they be back before nine in the evening.D they had to be back before nine in the evening.
Mother insisted that__ .
A they are to be back before nine in the evening.
B they ought to be back before nine in the evening.
C they be back before nine in the evening.
D they had to be back before nine in the evening.

Mother insisted that__ .A they are to be back before nine in the evening.B they ought to be back before nine in the evening.C they be back before nine in the evening.D they had to be back before nine in the evening.
选C
意思是“坚持要”,表示命令、要求,其后之宾语从句要用虚拟式动词原形
或者“should + 动词原形”
此处为表示命令
意思是“坚持说”,后面从句该是什么时态就是什么时态,不用虚拟~