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

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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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专业英语四级

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