单项选择题

It was not the first time he ______ . I think it’s high time we ______ to take him seriously.

A．take us in... begin
B．had taken us in... began
C．has taken us in... began
D．took us in... begin
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单项选择题
The ______ of the flood, which caused thousands of people to lose their houses, was 3 weeks of torrential min.
A．source
B．origin
C．root
D．resource
单项选择题
Digital recording has made ______ a significantly wider dynamic range, in recorded music.
A．for the possibility
B．the possibility is
C．it is possible
D．possible
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