单项选择题

Charles Babbage is generally considered ______the first computer.

A．to have invented
B．inventing
C．to invent
D．having invented
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单项选择题
It is the ability to do the job______ matters not where you come from or what you are.
A．one
B．that
C．what
D．it
单项选择题
The children are having a good time,______ with sand, others with toys.
A．some of them playing
B．who playing
C．some of whom are playing
D．some of them
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