单项选择题

The guard walled through the train________ everyone's ticket.

A．inspecting
B．overlooking
C．reviewing
D．conducting
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What________ have the Health Authorities taken to prevent the epidemic spreading
A．steps
B．plans
C．paces
D．grounds
单项选择题
Luxembourg lies________ Belgium, Germany and France.
A．among
B．within
C．between
D．inside
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