单项选择题

- Did you have a good sleep last night
- Yes, never sleep()

A. badly
B. better
C. worse
D. best

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单项选择题
Even if you are an experienced teacher, you sometimes () make some mistakes.

A. can
B. must
C. should
D. will
单项选择题
- What are on show in the museum - Some pictures ()by middle-school students.

A. taking
B. having been taken
C. taken
D. being taken
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