10[单选题,1.3分] Some studies confirmed that this kind of eye disease was __________ in tropical countries. A.perpetual B. prospective C.prevalent D.provocative

10[单选题,1.3分] Some studies confirmed that this kind of eye disease was __________ in tropical countries.
A.perpetual
B. prospective
C.prevalent
D.provocative

出自：河南大学-本科英语

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