Question

　　　is to be done is　　　to carry it out smoothly since the decision has been made.

A．What; how	B．Where; how
C．When; what	D．Where; what

Answer 1

选A。考查主语从句。句意: 既然已经做出了决定, 要做的就是如何去顺利完成。根据句意“需要做的……”用what; 语境“如何顺利完成……”用how, 故答案为A。