It is essential that all the details in this case ______ first.A、is investigated

游客2023-11-11  17

问题 It is essential that all the details in this case ______ first.

选项 A、is investigated
B、was investigated
C、be investigated
D、shall be investigated

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。
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