If they _____ us beforehand, we _____ the necessary mea-sures. Now it is too late. Choose the verbs which best complete the passage above: A) have warned – will take. B) had warned – will have taken. C) have warned – have taken. D) had warned – would have taken.

D) had warned – would have taken.

If they _ us beforehand, we _ the necessary mea-sures. Now it is too late. Choo...

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