Tom goes to school,but little Mary( ).She is only three.

题目

Tom goes to school,but little Mary( ).She is only three.
四个选项：1、isn't 2、won't 3、hasn't 4、doesn't

答案

答案： 4 doesn't
go to school 去上学, 主语是little Mary, 第三人称单数否定应该用助动词： doesn't
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