When Jane began to take swimming lessons, her main was the fear of waterA. evidenceB. cr

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A. evidence
B. crisis
(答案→)C. obstacle
D. danger
解析：obstacle意为“障碍（物），妨害，阻碍，干扰”，指对物体前进或事情发展起阻碍作用的东西，必须搬掉或绕过才能前进或发展。evidence意为“根据，证据”；crisis意为“危急关头，紧要关头”；danger意为“危险”。