The travels of Marco Polo in the twelfth century would not have been so well known ____ for the book he Wrote while in jail. A、it not have beenB、is not beenC、had it not beenD、has not been

The travels of Marco Polo in the twelfth century would not have been so well known ____ for the book he Wrote while in jail.

A、it not have been

B、is not been

C、had it not been

D、has not been


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