I could have turned to Mr. Smith for help, but he too busy then.A. isB. wasC. should beD.

发布时间：2020-08-14 23:14:30

I could have turned to Mr. Smith for help, but he too busy then.
A. is
B. was
C. should be
D. has been

网友回答

A. is
(答案→)B. was
C. should be
D. has been
解析：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。

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