单项选择题

A．they were
B．it was
C．there was
D．there were
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单项选择题
A．fromB．inC．byD．as
A．from
B．in
C．by
D．as
单项选择题
A．usefulB．reliableC．necessaryD．exciting
A．useful
B．reliable
C．necessary
D．exciting
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