已知 命题甲：函数f（x）=lg（ax²+ax+1）的定义域为（-∞，+∞）；命题乙：函数g（x）=lg（x²-ax+1）的值域为（-∞，+∞）．若上述两个命题同时为真命题，则实数a的取值范围为______．

Not a single word ______ when ______ about his family and his experiences in the beginning.[ ]

A. the young man said, asked        

B. did the young man say, asked

C. the young man said, asking        

D. did the young man say, to ask