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've got a very （） schedule today so I can't see you until tomorrow.

A．serious
B．big
C．tough
D．tight
单项选择题
Leave me alone; mind your own （）

A．events
B．affairs
C．things
D．matters
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