单项选择题

A．Two.
B．Five.
C．Three.
D．Four.
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单项选择题
Hardly ______ when the lights went out.
A．the performance had begun
B．had the performance begun
C．the performance began

D．did the performance begin
单项选择题
Language is a city, to the building of ______ every human being has brought a stone.
A．which
B．that

C．it
D．what
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