问题补充：
Do you know we have much difficulty the work on time..
A. on finishing
B. finishing
C. to finish
D. at finishing
答案：
A. on finishing
(答案→)B. finishing
C. to finish
D. at finishing
解析：考查固定短语在不同语境中的应用。have ….(much /great/little/…)difficulty （in）doing sth 意为“做…有….的困难”。题意为：你知道我们完成这项工作有很多的困难吗?故选B。
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