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【题目】Only when Shanghai sets population ceiling ________ solutions to water scarcity(水短缺) and big city diseases such as traffic jam.

A. it can find B. can it find

C. has it found D. it has found

【答案】B

【解析】考查倒装句。句意:只有当上海设定城市人口上限的时候它才能找到解决水短缺和诸如交通拥堵等大城市弊端问题的方法。此题考查only一词位于句首的倒装句的用法。only一词位于句首时,其后紧跟的条件句不需要倒装,后面的主句要使用部分倒装,题目中不表示完成,故选B。

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