I could have turned to Mr. Smith for help, but he ______ too busy then.
A．isB．wasC．should beD．has been
B
本題句意“我本可能救助魚史密斯先生的，但是他那時(shí)實(shí)在太忙了”。本句中的could have turned說明了動作發(fā)生在過去，有but轉(zhuǎn)折連詞，導(dǎo)出了后句的事實(shí)性。
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