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
The writer was always looking for suitable ______ to use in his next story.
A．contents
B．articles
C．pages
D．ideas
单项选择题
All students are ______ to the rules of the school.
A．obeying
B．object
C．subject
D．according
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