Only when _____ possible to settle the problem. [ ]

A. does he come will it be

B. he comes it will be

C. has he come it will be

D. he comes will it be

推动出台（）可以加强能源法治建设，完善能源法律法规体系。

A.《可再生能源法》

B.《循环经济促进法》

C.《电力法》

D.《能源法》