Charles Babbage is generally considered ________ the first computer. 
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A
to invent
B
inventing
C
to have invented
D
having invented
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Upon ________ his studies, he started travelling in China. 
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A
finish
B
finishing
C
he finished
D
finished
Nobody but doctors or nurses and those ________ by Dr Li ________ to enter the patient’s room.
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A
being invited;allowed
B
are invited;are allowed
C
invited;is allowed
D
invited;are allowed