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
Your experiment reports must be checked with care before
A．handed them in
B．them handing in
C．being handed in
D．handing them in
单项选择题
I ______ asleep in the corner, for I remember nothing of what happened during the night.
A．might fall
B．must fall
C．must have fallen
D．can have fallen
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