单项选择题


A．studied
B．researched
C．surveyed
D．observed
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单项选择题
A．possibleB．difficultC．likelyD．improbable
A．possible
B．difficult
C．likely
D．improbable
单项选择题
A．revealedB．exposedC．openedD．shown
A．revealed
B．exposed
C．opened
D．shown
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