问题
单项选择题
There is a（）mine in position 50°N，30°W.
A.drifting
B.drifted
C.drift
D.draft
答案
参考答案：A
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There is a（）mine in position 50°N，30°W.
A.drifting
B.drifted
C.drift
D.draft
参考答案：A