单项选择题

A few weeks later, the patient was able to carry out ______ seemed to be normal conversation.

A．which
B．what
C．when
D．how
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单项选择题
It was his way of singing ______ his voice that really impressed me.
A．rather than
B．or rather
C．as for
D．more than
单项选择题
It is well known that Tomas Edison ______ the electric lamp.
A．discovered
B．developed
C．found
D．invented
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