单项选择题

A．which
B．though
C．where
D．when
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单项选择题
A．being calledB．callingC．calledD．having called
A．being called
B．calling
C．called
D．having called
单项选择题
A．discoveryB．inventionC．searchD．research
A．discovery
B．invention
C．search
D．research
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