A computer ______ think for itself. It’s always told to do things.
A. mustn’t        B. can’t           C. shouldn’t
B
因為mustn’t 意為“不允許,禁止”; can’t意為“不可能”; shouldn’t意為“不應該”。此處句子強調(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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