单项选择题

They want to know ______ do it to help us.

A．what can they
B．what they can
C．how they can
D．how can they
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单项选择题
After he gave a report about the school, Mr. White ______ the visitors around it.
A．went on to show
B．went on showing
C．went on with showing
D．keep on showing
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