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Only when the circuit breaker mechanism ...

Only when the circuit breaker mechanism was triggered________what a negative impact the epidemic had made on the country’s economy.

A.had they realized B.they realized C.they realize D.did they realize

 

D 【解析】 考查倒装句。句意:只有当熔断机制的触发他们才意识到这场流行病对该国经济造成了多大的负面影响。only 加状语从句位于句首,后面用部分倒装。was 提示用一般过去时,触发时才意识到,故选D。  
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