单项选择题

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

A．engage
B．devote
C．seek
D．pursue
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单项选择题
He tricked her______ marrying him by pretending that he was rich.
A．into
B．in
C．to
D．onto
单项选择题
Your advice would be______ valuable to him, who is at present at his wit's end.
A．exclusively
B．extensively
C．excessively
D．exceedingly
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