He _______ the best person you had been expecting for the job, but who else _______?

A．may not be; could be

B．couldn’t be; might be

C．might not have been; could have been

D．mustn’t be; must have been

国务院能源主管部门依照法律规定，在全国管道保护中的职责有哪些？（）

A.负责组织编制并实施全国管道发展规划

B.主管管道的铺设及建设工作

C.统筹协调全国管道发展规划与其他专项规划的衔接

D.协调跨省、自治区、直辖市管道保护的重大问题