单项选择题


A．being invented
B．invented
C．have now been invented
D．have now invented
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单项选择题
A．fromB．toC．withD．by
A．from
B．to
C．with
D．by
单项选择题
A．had to beB．was to beC．must have beenD．would be
A．had to be
B．was to be
C．must have been
D．would be
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