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A
set off
B
called off
C
broken off
D
worn off
正确答案 :A
解析
本题考查动词短语辨析。
句意“火药立即起火,引发了一连串的爆炸。”A项:set off“引爆;触发;引起”,故A项符合题意。
B项:call off“取消”,不符合题意,故排除。
C项:break off“脱落,用力移除;突然停止;终止”,不符合题意,故排除。
D项:wear off“逐渐消失”,不符合题意,故排除。
故本题答案为A。
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