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【单选题】
行列式D的值为m,对换行列式D的任意两列后,得到新的行列式的值为( )
A.
m
B.
0
C.
-m
D.
无法确定
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B.
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【单选题】—Do you often hear John _____ in his room? —Yes, listen! Now we can hear him ____ in his room. [     ]
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