A computer ______ think for itself. It’s always told to do things.
A. mustn’t        B. can’t           C. shouldn’t
B
因?yàn)閙ustn’t 意為“不允許，禁止”； can’t意為“不可能”； shouldn’t意為“不應(yīng)該”。此處句子強(qiáng)調(diào)的是：電腦不能夠自己思考，只能服從人類的指令。所以B合適。
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