21．______ what would happen，none of them could find a way out．

A. Left wondering    B．Having left wondering

C．Leaving to wonder D．Having left to wonder

22．______ ，he listened to me patiently．

A．As he was angry    B. Angry as he was

C．Angry as was he    D．As angry he was

23．一Did you tell him the bad news last night?

一Yes．but l wish I______   

A．didn’t    B．hadn’t   

C．don’t   D．haven’t