题目内容：
That was a difficult question, but Mary still _______ to work it out.A.did B.failed C.kept D.managed
参考答案：
选择题：That was a difficult question, but Mary still ____
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- 题目类型：选择题
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A.did B.failed C.kept D.managed
A.did B.failed C.kept D.managed
(多选题) 保险单按保险期间可分类为( )(本题4.0分)A. 定值保险单B. 混合保险单C. 航程
(多选题) 保险单按保险期间可分类为( )(本题4.0分)A. 定值保险单B. 混合保险单C. 航程保险单D. 定期保险单
发明、实用新型和外观设计专利申请文件中都包括（ D ）。
发明、实用新型和外观设计专利申请文件中都包括（ D ）。
______ did he know what had happened during the tw
______ did he know what had happened during the two months when he was away.A.A
一种新型食品的制作方法可以提出( B )
一种新型食品的制作方法可以提出( B )
I often see _________ the road on his way home.A.
I often see _________ the road on his way home.A. he crossB. him crossC. h