单项选择题

In the face of unexpected difficulties, he demonstrated a talent for quick, ______ action.

A．determining
B．defensive
C．demanding
D．decisive
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单项选择题
The scientists have made an ______ study of the viruses that cause the disease.
A．exhausted
B．exhausting
C．exhaustive
D．exhaustion
单项选择题
Tim has failed three courses this semester, so he will have to ______ them next semester.
A．remake
B．repeat
C．reapply
D．revise
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