So far,China's sent up four manned speaceships into space.,A,So it is.B,So has it.C,So isit.D.So it has.选哪个为什么?

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So far,China's sent up four manned speaceships into space.,
A,So it is.B,So has it.C,So isit.D.So it has.选哪个为什么?

D
china's sent up.中's为has缩写
对话中,做同意以上说法的回答,类似于常见的so it is的回答,不过根据动词,选d