单项选择题

______ entering his flat, Jack was shocked to find his new computer missing.

A．In
B．On
C．By
D．At
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单项选择题
He did very well in all the examinations because he had the ______ to study hard.
A．encouragement
B．determination
C．enthusiasm
D．decision
单项选择题
Before the telephone was ______ , man had no way of talking to each other except face to face.
A．invented
B．discovered
C．installed
D．created
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