Are they still doing the experiment? They're supposedit by the end of last class.A. finish

发布时间：2020-08-16 08:37:47


Are they still doing the experiment? They're supposed    it by the end of last class.
A. finish
B. finished
C. to finish
D. to have finished

网友回答

A. finish
B. finished
C. to finish
(答案→)D. to have finished
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