单项选择题

A．being called
B．calling
C．called
D．having called
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单项选择题
A．discoveryB．inventionC．searchD．research
A．discovery
B．invention
C．search
D．research
单项选择题
A．doesB．didC．had doneD．was doing
A．does
B．did
C．had done
D．was doing
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