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
(Not having passed) the law exam, (the state) refused (to issue him) a license (to practice).（）

A．Not having passed
B．the state
C．to issue him
D．to practice
单项选择题
If he had applied (by August) 15, the university (had accepted) (him) (this) semester.（）

A．by August
B．had accepted
C．him
D．this
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