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The Smiths ______ in China for three years.

A. is been
B. have been
C. are gone
D. is gone
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科目:初中英语 来源:0101 月考题 题型:单选题

The Smiths ______ in China for three years.
[     ]
A. is been
B. have been
C. are gone
D. is gone

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