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问题
判断题
黑色星期五的关键词是便捷。
答案
参考答案：
错
单项选择题
1968年美国军备开支为多少亿美元（）
A．1000
B．800
C．700
D．600
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选择题
—How long _____?
—Three years.
A.did they get married
B.were they married
C.have they got married
D.have they been married
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