A computer ______ think for itself. It must be told what to do.

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问题 A computer ______ think for itself. It must be told what to do.

选项 A、can’t
B、couldn’t
C、may not
D、might not

答案A

解析 考查情态动词。could、may和might表示的都是一种可能性,只有can表示的是能力,而本题指电脑是不能自己思考的,因此选can’t。
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