—I felt it very difficult to carry on the work all by myself. —I could have helped you bu

问题补充：

—I felt it very difficult to carry on the work all by myself.

—I could have helped you, but you me to.

A. hadn’t asked

B. didn’t ask

C. haven’t asked

D. don’t ask

答案：

A. hadn’t asked

(答案→)B. didn’t ask

C. haven’t asked

D. don’t ask

解析：

这题考查时态的用法：因为I could have helped you,是“过去本可以帮你（却没帮），后面的你没有叫我，是过去的事实。用过去时，选B。