已知向量a=(1，y)，b=(x，4)，若a∥b，则xy的值为（　　）-湖北继续教育网网校

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[单选题]已知向量a=(1，y)，b=(x，4)，若a∥b，则xy的值为（　　）

A-4

B4

C1/4

D-1/4

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