I could have helped him out to tell the truth I too busy.A. amB. wasC. have beenD. had

问题补充：

I could have helped him out, to tell the truth, I too busy.

A. am

B. was

C. have been

D. had been

答案：

A. am

(答案→)B. was

C. have been

D. had been

解析：考查时态。句意：我本来能够帮助他，说实话，我太忙了。结合语境可知下文描述的是过去的状态，故用一般过去时态，选B。