823. What a pity!I missed meeting my boss at the airport because my car was ____ in the traffic jam.

A.broken up

B.kept back

C.held up

D.held back

824.What's the matter with Jason? He looks a bit upset.

Didn't you know? When he returned from his holiday last night,he found his house _______.

A.broken off

B.broken into

C.broken down

D.broken out

823.答案是C;

此题表示“因交通拥挤而堵塞”,hold up被耽误/延误，符合题意。

824.答案是B;

break off中断， 折断，突然停止;break into闯入，打断，突然中断;break down出故障，中断，分解；break out 突然发生，爆发。