单项选择题

As she ______the newspaper, Granny ______asleep.

A．read; was falling
B．was reading; fell
C．was reading; was falling
D．read; fell
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单项选择题
______ a reply, he decided to write again.
A．Not receiving
B．Receiving not
C．Not having received
D．Having not received
单项选择题
Charles Babbage is generally considered ______ the first computer.
A．to invent
B．inventing
C．to have invented
D．having invented
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