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【简答题】
设4×4矩阵A=(α，γ2，γ3，γ4)，B=(β，γ2，γ3，γ4)，其中α，β。γ2，γ3，γ4均为4维列向量，且已知行列式|A|=4，|B|=1，求行列式|A+B|。
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uses to be
B.
used to be
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uses to being
D.
used to being
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A.
hitting
B.
beating
C.
hurting
D.
striking
【单选题】Tina isn’t so quiet as she . She is much more outgoing now.
A.
did
B.
used to
C.
was used to
D.
used to be
【单选题】The room was so quiet that she could hear the _____ of her heart.
A.
hitting
B.
beating
C.
tapping
D.
knocking
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A.
It never occurred to
B.
That never occurred to
C.
It never occurred with
D.
That never occurred for
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