问题补充:
----Have they finished the project?
---- Yes. By the end of last month, they it. Now they on a new one.
A. had finished; are working
B. had finished; work
C. have finished; are working
D. have finished; work
答案:
(答案→)A. had finished; are working
B. had finished; work
C. have finished; are working
D. have finished; work
解析:考查时态,第一空时间是By the end of last month,by+过去时间,要和过去完成时连用,第二空时间是now,用现在进行时,句意:--他们的计划完成了吗?--是,到上个月底为止,他们已经完成了。现在正从事新的计划。选A。