____ is impossible to learn a foreign language well in such a short time ,Rome was not built in oneday.A.This B.It C.That D.Which

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____isimpossibletolearnaforeignlanguagewellinsuchashorttime,Romewasnotbuiltinoneday.A.ThisB.ItC.That

____ is impossible to learn a foreign language well in such a short time ,Rome was not built in oneday.A.This B.It C.That D.Which
____ is impossible to learn a foreign language well in such a short time ,Rome was not built in one
day.
A.This B.It C.That D.Which

____ is impossible to learn a foreign language well in such a short time ,Rome was not built in oneday.A.This B.It C.That D.Which
it.B
这是一个形式主语,所以用it开头