单项选择题


A．convert
B．transform
C．alter
D．vary
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单项选择题
The Greek alphabet was simpler than the Egyptian system for all the following reasons EXCEPT that ______ .
A．the former was easy to write
B．there were fewer signs in the former
C．the former was easy to pronounce
D．each sign stood for only one sound
单项选择题
His career was not noticeably ______ by the fact that he had never been to college.
A．prevented
B．prohibited
C．hindered
D．refrained
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