专四
A.frustrated
B.prevented
C.discouraged
D.accomplished
【解析】词语搭配。frustrate可与efforts搭配,表示“使……(的努力)受挫”。D.accomplished不合句意;B.prevented和C.discouraged都有“阻碍,阻止”的意思,符合句意,但一般都不与efforts搭配。prevent的常用表达为prevent…from doing;而discourage后接宾语为人时,表示“使人沮丧”,强调情绪上的情况。当discourage表示“阻止”时,宾语为所阻止的具体行为,而不是泛泛的efforts,如:The school teachers discourage smoking.(学校老师不赞成吸烟。)当使用discourage sb.from doing sth.时,discourage与prevent同义。
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