---Why didn’t you go shopping with me two hours ago?

---Because my mother________ me outside.

A．waited for

B．is waiting for

C．was waiting for

D．has waited for

患者，男，60岁，血源性肺脓肿患者，突然出现左胸痛，继之呼吸困难。查体：口唇发绀，气管右移，左肺呼吸音减低，最可能发生的是（）

A.急性心肌梗死

B.肺梗死

C.自发性气胸

D.急性左心衰竭

E.阻塞性肺不张