We __________ be more careful, or we wil...

We __________ be more careful, or we will make the same mistake (错误) in the exam.

A.may B.can C.should

C 【解析】句意：我们应该更认真，否则我们会在考试中犯同样的错误。考查情态动词。may情态动词，可以；can情态动词，能够；should情态动词，应该。根据句意可知我们在实验中会犯同样的错误，所以我们应该更加细心一点。空白处应该表示“应该”的含义。故选C。

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