2L 正解 If+were+to的用法在advanced grammar in Use 的第83页有说到,多用于不可能发生的情况 In unreal conditionals we can use if …were + to-infinitive rather than if + past simple to talk about imaginary future situations, particularly when it is unlikely that the situation in the if-clause will happen
if we were to事实上在口语中也会用到,参见2016年11月16日的首相质询(PMQ)环节 当Theresa May被问到,为何迟迟不阐明脱欧方案时,她回答: “Of course those in the European Union whom we will be negotiating with , will want us to set out at this stage every detail of our negotiating strategy. If we were to do that... if we were to do that, it will be the best possible way of ensuring we got the worst result for this country ! That's why we won't do it ! ”