There are certain _______when you have to interrupt people who are in the middle of doing something.A.chancesB.situationsC.occasionsD.opportunities
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C解析考查．近义名词辨析。本句理解为：在某种场合下，你不得已做某事。occasion“场合，时机”：a formal occasion正式场合；与occasion搭配的相关词组：by occasion of由于，因为；on occasion(s)偶尔，间或，有时；on the occasion of在…之际；chance和opportunity表示为实现计划或愿望而获得的机会：Opportunity knocks at the door only once. 机不可失，时不再来。have a chance to see the hero有机会看到英雄；situation“形势，局面；处境”：get into a difficult situation陷入困境。句意为：有些时候别人做着事你不得不打断。