单项选择题

The shutdown of the machine was due to its________ parts.

A．decayed
B．detective
C．deficient
D．spoiled
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The guard walled through the train________ everyone's ticket.
A．inspecting
B．overlooking
C．reviewing
D．conducting
单项选择题
What________ have the Health Authorities taken to prevent the epidemic spreading
A．steps
B．plans
C．paces
D．grounds
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