以下哪一种方法是目前诊断胃食管反流最可靠的方法（）

A.食管钡餐造影

B.食管压力测定

C.食管内镜检查

D.食管pH动态监测

E.超声学检查

—He is ________ a brave man.

—We can’t admire his courage___________.

A．actually; very much

B．indeed; too a lot

C．really; too much

D．truly; a bit