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______ the advice of his friends, he would not have suffered such a heavy loss in his business.
A、If he took
B、If he should take
C、Were he to take
D、Had he taken
【正确答案】：D
【题目解析】：如果他听从他朋友的意见，他就不会在他的生意遭受了这样的重大损失。