题目内容

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
考查倒装句。only+when引导的状语从句提前,主谓应部分倒装。排除B、C; 有根据broken down,可知应用过去时,故答案为A。
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