Science and technology have ___A_____ in important ways to the improvement o

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• science and technology have important ways to the improvement of agricultScience and technology have____in important ways to the improvement of agricultural production.
• Science and technology have ___A_____ in important ways to the improvement oA) attachedB) assistedC) contributedD) witnessed为什么不能选A?
• Science and technology have____in important ways to the improvement of agricultural production.应该用contributed还是attached?
• Science and technology have ___A_____ in important ways to the improvement o
• Science and technology have____in important ways to the improvement of agricultural production.
• science and technology have important ways to the improvement of agricult
• 现规定一种新的运算：a△b=2a^3-4ab.若（-2）△x=2△x,试计算（3x-4)/2的值．
• 为什么the science and technology 后面可用has不用have