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only放句首時，后面的主句要用部分倒裝句，即提前助動詞或者情態(tài)動詞，根據(jù)句子結(jié)構(gòu)可知，主句的時態(tài)應(yīng)當和when引導(dǎo)的時間狀語從句的時間保持一致，所以選擇A
句意為，只有當歐洲國家的經(jīng)濟體系崩潰的時候，他們才會決定采取措施處理這些問題。
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