When the old man was ___ , he felt ___.

A．alone, lonely

B．lonely, alone

C．alone, alone

D．lonely, lonely

与基坑明挖法相比，盖挖法施工最显著的优点是（）。

A.施工成本低

B.出土速度快

C.围护变形小

D.可尽快恢复交通