A: Why its eight oclock already. B: Im surprised at_____being so late.A.itB.itsC.it isD.i

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A: Why, its eight oclock already. B: Im surprised at_____being so late.

A.it

B.its

C.it is

D.it"s

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗