题目内容:
Scienceandtechnologyhave___inimportantwaystotheimprovementofagriculturalproduction.
A)attachedB)assistedC)contributedD)witnessed
参考答案:
Scienceandtechnologyhave___inimportantwaystotheimprovementofagriculturalproduction.
A)attachedB)assistedC)contributedD)witnessed