问题
选择题
—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
答案：B
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。