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，有位女士在學校大門口等你．
--一定是我媽媽．我讓她給我拿一些衣服來．

解答 答案：A．must一定，必須；shouldn't不應該；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，所以那位女士一定是我媽媽，表示肯定的推測，而且可能性很大，一般用must．故選A．

點評 本題考查了情態(tài)動詞的用法．解答時，注意must表示推測時，可能性很大，而may表示推測時，可能性比較�。�

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