—I telephoned him twice and I couldn’t get through to him. 

—The line might have been out of order,     ?

A．don’t you

B．wasn’t it

C．do you

D．hadn’t it

上叶大叶性肺炎吸收期主要需鉴别疾病是（）。

A.支气管肺炎

B.支原体肺炎

C.化脓性肺炎

D.肺脓肿

E.肺结核