They_____carefully,but they didn't_________anything.A.listened;listen B.listened;hear C.heard;hear

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They_____carefully,but they didn't_________anything.A.listened;listen B.listened;hear C.heard;hear b b, b b (b, B b b B b. b b b b b 求下列行列式 a b b b b a b b b b a b b b b a 计算a+b/b-a-b/b