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
—What's the matter Why ______ —The signal is against us.
A．the train stopping
B．does the train stop
C．is the train stopping
D．did the train stop
单项选择题
He said that there was nothing to be ______.
A．ashamed
B．ashamed in
C．ashamed of
D．ashamed at
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