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【单选题】
已知4阶矩阵A的第二行的元素依次为1,1，-2,2，它们式的值分别为-2,2，-1,1，则A的行列式为A.
4
B.
-4
C.
5
D.
-5
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举一反三
【单选题】She is a hardworking student, and all her spare time she has ________ staying in the library.
A.
spent
B.
is spent
C.
to spend
D.
to be spent
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