15．-Whose blouse is this？Is it Sally's？
-It        be hers．It's too big for her．（　�。�
A．mightB．needn'tC．mustn'tD．can't

分析 -這個襯衫是誰的？是薩利的嗎？-這個不可能是她的．這個襯衫對她來說太大了．

解答 正確答案：D．四個選項都是情態(tài)動詞，A是may的過去式，表示"也許、可能"．B是"不必"．C是"不能、不許"．D是"不會、不可能"．根據(jù)答語"It is too big for her．"可推測"這個襯衫不可能是薩利的"，且情態(tài)動詞can后加動詞原形，表示對現(xiàn)在情況的推測，常用于否定句和疑問句中．所以正確答案是D．

點評 本題考查情態(tài)動詞can表示推測的用法，注意can't表示推測常用于否定句和疑問句，如表示對現(xiàn)在情況的肯定推測則只能用情態(tài)動詞must．

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