actleader wrote:
Less than 90 years after the Mongol hordes broke out of the borders of present-day Mongolia , the Mongol Empire stretched from the Sea of Japan in the east to the Danube in the west.
(A) Less than 90 years after the Mongol hordes broke out of the borders of present-day Mongolia
(B) In less than 90 years since the Mongol hordes breaking out of the borders of present-day Mongolia
(C) In less than 90 years since the Mongol hordes had been broken out of the borders of present-day Mongolia
(D) It took
...
