单项选择题
Such problems ______ air pollution and traffic jams are becoming more and more serious in some big cities.
A．like
B．about
C．as
D．of
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单项选择题
Mr. Phillips caught up with the boy in the corridor and ____ his hand on his shoulder.
A．lay
B．lain
C．lied
D．laid
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单项选择题
All _____ is to give him a warning.
A．what is needed
B．is needed
C．that is needed
D．the needed thing
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