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【简答题】
判断 ，x∈(-∞，+∞)的奇偶性．
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皮皮学刷刷变学霸
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A.
on leave
B.
on duty
C.
on patrol
D.
on guard
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【单选题】Mr.White works in an import and export company,but he_____for this industrial fair,since he is on leave.
A.
has worked
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has been working
D.
is working
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