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—Hasyourfriendcompletedhisdesign?—Notyet.He

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问题详情：

—Hasyourfriendcompletedhisdesign?—Notyet.He

—Has your friend completed his design?

—Not yet. He _______ on it last night.

A. worked B. has worked C. is working D. was working

【回答】

D

知识点：动词时态

题型：选择题

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