A-A+
It is essential that all the details in this c
问题详情
It is essential that all the details in this case ______ first.
A．is investigated
B．was investigated
C．be investigated
D．shall be investigated
参考答案
正确答案：C
解析：It is essential that．．．的句式要求从句中使用虚拟语气，因此只有选项C是正确的。其他的选项均为迷惑项。
