◎ 题干
Susan decided not to work on the program at home because she didn't want her mother to know
what she _____.

[     ]

A. has done
B. had done
C. was doing
D. is doing
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Susan decided not to work on the program at home because she didn't want her mother to know what she _____. [ ]A. has done B. had done C. was doing D. is d…”主要考查了你对  【过去进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。