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Only when the European countries' financial system broke down _____to take measures to deal with those problems.
A.did they decideB.they decidedC.they had decidedD.had they decided
A
考察倒装句,当only放句首时,后面的主句要用部分倒装句,即提前助动词或者情态动词,根据句子结构可知,主句的时态应当和when引导的时间状语从句的时间保持一致,所以选择A
句意为,只有当欧洲国家的经济体系崩溃的时候,他们才会决定采取措施处理这些问题。
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