单项选择题

CSS3中,背景色从蓝色到黑色,并且由左到右线性渐变的正确写法是()

A.background:linear-gradient(to right,blue,black)
B.background-posotion:linear-gradient(to right,blue,black)
C.background:linear-gradient(to right bottom,blue,black)
D.background:linear-gradient(-90deg,blue,black)

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