-DidBillyandAnnafindawayoutatlast?-Yes,they

问题详情：

 -Did Billy and Anna find a way out at last?

-Yes, they _____ a plan and did it.

A. were working out    B. worked out    C. are working out    D. have worked out

【回答】

B

知识点：动词时态

题型：选择题