单项选择题

Our research has focused on a drug which is so ______ as to be able to change brain chemistry.

A．powerful
B．influential
C．monstrous
D．vigorous
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单项选择题
Jack is good, kind, hard-working and intelligent. ______, I can't speak too highly of him.
A．As a result
B．By the way
C．In a word
D．On the contrary
单项选择题
The police carried out an ______ investigation, but the missing woman was not yet found.
A．exhausting
B．exhaustible
C．exhaustive
D．exhausted
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