7．-Lingling，a lady is waiting for you at the school gate．
-It ________ be my mother．I asked her to bring me some clothes．（　�。�
A．mustB．shouldn'tC．can'tD．may

分析 句意：--玲玲，有位女士在學(xué)校大門(mén)口等你．
--一定是我媽媽?zhuān)易屗o我拿一些衣服來(lái)．

解答 答案：A．must一定，必須；shouldn't不應(yīng)該；can't不能；may可能．根據(jù)I asked her to bring me some clothes，可知我讓她給我拿一些衣服來(lái)，所以那位女士一定是我媽媽?zhuān)硎究隙ǖ耐茰y(cè)，而且可能性很大，一般用must．故選A．

點(diǎn)評(píng) 本題考查了情態(tài)動(dòng)詞的用法．解答時(shí)，注意must表示推測(cè)時(shí)，可能性很大，而may表示推測(cè)時(shí)，可能性比較�。�

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