Question 5 of 10 Why did the Ming dynasty need to repair China's canal systems?
A. The systems had been destroyed during the Qin dynasty.
B. The systems had decayed during the Yuan dynasty.
C. The systems had become outdated during the Qing dynasty.
O D. The systems had been damaged during Mongol attacks.
SUBMIT

B the systems had decayed during the Yuan dynasty

others, still angry about the revolution, argued against a commercial treaty with the britain promised to withdraw all of its troops from america after the in the northern frontier, however, the british refused to surrender several military posts on a stronger central government in america may have resolved these foreign.

hope this : d