9.TheThreeGorgesDamwhichisthebiggestconstruc-tionprojectinChinasincethebuildingoftheGreatWallandtheGrandCanaltocontrolflood-ingandprovidehydro-electricpowerforthecentralregionofChina.A.wasbuilt

Question

9. The Three Gorges Dam which is the biggest construc- tion project in China since the building of the Great Wall and the Grand Canal ____ to control flood- ing and provide hydro-electric power for the central region of China.

   A. was built   B. is built

   C. will be built   D. has been built

Answer 1

9. D9. D解析：由since引导的时间状语可 知，应用现在完成时态，故选D项。