A:completed; wouldn't have been
B:had completed; wouldn't have been
C:has completed; wouldn't be
D:completes; wouldn't be
如图是人体消化系统组成示意图,对图中④的描述正确的是( )
— How was your stay in Hong Kong?
—________. And it was a pity that I couldn't stay there longer.
已知a∈R,则“a>2”是“a2>2a”的( )