…………….. all necessary preparations, we put our plan into action.

A. Trang An Scenic Landscape Complex is the eighth World Heritage Site in Vietnam to have been recognised by UNESCO.

B. Trang An Scenic Landscape Complex is the eighth World Heritage Site in Vietnam to has been recognised by UNESCO.

C. Trang An Scenic Landscape Complex is the eighth World Heritage Site in Vietnam to ave been recognised by UNESCO.

D. Trang An Scenic Landscape Complex is the eighth World Heritage Site in Vietnam to have recognised by UNESCO.

A. Having met her before, I still remember that.

B. Having meet her before, I still remember that.

C. Having met her before, I still remembered that.

D. Having to met her before, I still remember that.

A. achievement

D. transportation

B. have read

C. have been reading

D. had read

A. becomes

B. become

C. becoming

D. became

B. have been studying

D. study