单选题
68、He gets （ ）when people don't understand what he’s trying to say.
参考答案
B
题目详解：
句意：大家都不理解他要说什么，他为此感到很受挫。
defeat v. 击败，战胜 a defeated army 败军
frustrate v. 使沮丧，挫败 Roberta felt frustrated and angry.
contaminate v. 污染，玷污
The drinking water has been contaminated with lead. 饮用水被铅污染了。
exhaust v. 使疲惫 exhausted a. 疲惫不堪的
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