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．settlingB．inhabitingC．existingD．establishing
A．settling
B．inhabiting
C．existing
D．establishing
单项选择题
A．hardlyB．closelyC．certainlyD．nearly
A．hardly
B．closely
C．certainly
D．nearly
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