[单选题]Bob would have helped us yesterday, but he( ).

A

was busy

B

is busy

C

had been busy

D

will be busy

正确答案:A
题目解析

本题考查时态。前句表示对过去的虚拟,而but之后表示过去的客观事实,故用一般过去时态。

句意:Bob昨天本要帮助我们的,但是他太忙了。

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