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英语单选,求解答.为啥选A,D不可以吗?

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英语单选,求解答.为啥选A,D不可以吗?
______ an important decision more on reason than on emotion, and you will never regret it. A. Base B. Based C. Basing D. Having based
此题的正确答案是:【A】
这是个固定句型
祈使句(动词原形开头,表条件) + and + 陈述句(一般用will + 动词原形)
Work hard ,and you'll catch up with him.
=If you work hard,you'll catch up with him
如果表否定,中间用or
Hurry up,or you 'll miss the train.
=If you don't hurry,you'll miss the train
祈使句是以动词原形开头的,所以选A