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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单项选择题
What's the language ______ in Germany
A．speaking
B．spoken
C．be spoken
D．to speak
单项选择题
She pretended ______ me when I passed by.
A．not to see
B．not seeing
C．to not see
D．having nut seen
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