问题
选择题
Lisa was supposed her homework before nine o'clock. But she couldn't.
A．to finish
B．to finishing
C．finish
D．finishing
答案
答案：A
题目分析：句意：丽莎应该在九点之前完成她的家庭作业。但是她不能。 be supposed to do sth应该做某事，所以选A。
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