Commander-in-Chief of the armed forces, I have directed that all measures _________ for our defense．A.had been takenB.would be takenC.be takenD.to be taken
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C解析句意：作为武装力量的总司令，我已下令采取一切措施加强保卫。在表示要求、提议、命令、推测、主观判断的动词如：suggest, demand, direct, require, insist, move(提议)等词后的从句用虚拟语气。这种从句的谓语要用(should+)动词原形。