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
考察倒裝句，當(dāng)only放句首時(shí)，后面的主句要用部分倒裝句，即提前助動(dòng)詞或者情態(tài)動(dòng)詞，根據(jù)句子結(jié)構(gòu)可知，主句的時(shí)態(tài)應(yīng)當(dāng)和when引導(dǎo)的時(shí)間狀語(yǔ)從句的時(shí)間保持一致，所以選擇A
句意為，只有當(dāng)歐洲國(guó)家的經(jīng)濟(jì)體系崩潰的時(shí)候，他們才會(huì)決定采取措施處理這些問(wèn)題。
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