Bob would have helped us yesterday but he.A. was busy busyB. is busyC. had been busyD. wi

问题补充：

Bob would have helped us yesterday ,but he.

A. was busy busy

B. is busy

C. had been busy

D. will be busy

答案：

(答案→)A. was busy busy

B. is busy

C. had been busy

D. will be busy

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