Question

I could have turned to Mr. Smith for help, but he ______ too busy then.

A．is

B．was

C．should be

D．has been

Answer 1

B

本题句意“我本可能救助鱼史密斯先生的，但是他那时实在太忙了”。本句中的could have turned说明了动作发生在过去，有but转折连词，导出了后句的事实性。