单项选择题

______ no conclusive evidence exists, many experts believe that the wheel was invented only once and then diffused to the rest of the world.

A．Even
B．But
C．Although
D．So
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单项选择题
______ stereophonic phonograph records, two recordings are made of the same musical performance.
A．Creates
B．Created
C．The creating of
D．To create
单项选择题
______ we have finished the Course, we shall start doing more revision work.
A．For now
B．Since that
C．Now that
D．By now
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