单项选择题

As no one in the small village knew nothing about medicine, Mrs. Smith, a former nurse, had to work as a doctor.()

A. knew
B. nothing
C. had to
D. as

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单项选择题
Mary was surprised to realize that it was us, her old school friends, calling her from Paris.()

A. surprised to
B. us
C. school friends
D. calling
单项选择题
Let's go and ask the teacher, will you()

A. go
B. and ask
C. the teacher
D. will you
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