◎ 题干
I'd rather not sign up for (登记) the Computer Camp because I             last year.
[     ]
A. had joined
B. has joined
C. joined
D. was joining
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“I'd rather not sign up for (登记) the Computer Camp because I last year. [ ]A. had joined B. has joined C. joined D. was joining …”主要考查了你对  【实义动词的过去式】【一般过去时】  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。