单项选择题

The scientists have absolute freedom as to what research they think it best to ________.

A．engage
B．chase
C．seek
D．pursue
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单项选择题
Divorce is lawful but subject to various legal requirements before taking final ________.
A．force
B．effect
C．action
D．influence
单项选择题
When confronted with such questions, my mind goes ________, and I can hardly remember my own date of birth.
A．dim
B．faint
C．vain
D．blank
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