问题补充：
--Do you have any trouble the work?
---No． in fact we have finished it already．
A. finishing
B. to finish
C. finish
D. finished
答案：
(答案→)A. finishing
B. to finish
C. finish
D. finished
解析：这题考查词组：have trouble （in）doing“做某事很困难”，句意是：--你完成工作有困难吗？--不，事实上我们已经完成了。选A。
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