单项选择题

A．true
B．untrue
C．impossible
D．possible
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单项选择题
A．delayB．deliverC．conveyD．communicate
A．delay
B．deliver
C．convey
D．communicate
单项选择题
A．being inventedB．inventedC．have now been inventedD．have now invented
A．being invented
B．invented
C．have now been invented
D．have now invented
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