问题描述：
The boy used to work hard in the evening.(改为否定句） The boy ______ ______ _______ work hard in
The boy ______ ______ _______ work hard in the evening.
=The boy ______ ______ work hard in the evening.
The boy ______ ______ _______ work hard in the evening.
=The boy ______ ______ work hard in the evening.
问题解答：
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