单项选择题

Without a(an) ______ passport a tourist is forbidden to enter a country.

A. operative
B. effective
C. valid
D. efficient
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单项选择题
She takes ______ interest in the economic reform in Chin
a.A. considerableB. conventionalC. considerateD. conservative
单项选择题
To most of the undergraduate students, the doctoral degree is a distant ______。
A. theme
B. prospect
C. threshold
D. token
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