单项选择题

______ did the refugees receive help from countrymen.

A．At a time
B．At all time
C．At no time
D．At anytime
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It's an increasing popular ______.
A．interview
B．review
C．preview
D．view
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I am sure Tom has been here and has done ______.
A．that required him
B．which was required of him
C．what was required of him
D．what has been required him
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