1．A computer ______ think for itself．It's always told to do things．（　�。�
A．mustn'tB．can'tC．shouldn't

分析 電腦不能夠自己思考，他總是去做被要求做的事情．

解答 答案：B．
mustn't 不允許，禁止"； can't不能； shouldn't不應(yīng)該．此處句子強(qiáng)調(diào)的是：電腦不能夠自己思考，他總是去做被要求做的事情，所以B合適表不能．故選B．

點(diǎn)評(píng) 本題考查了情態(tài)動(dòng)詞的用法．解答時(shí)注意理解句意以及所給選項(xiàng)的意思并作出正確選擇．

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