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
考查倒裝句。only+when引導(dǎo)的狀語從句提前，主謂應(yīng)部分倒裝。排除B、C; 有根據(jù)broken down，可知應(yīng)用過去時(shí)，故答案為A。
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