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
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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
单项选择题
Leave me alone; mind your own ______.
A．events
B．affairs
C．things
D．matters
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