Whenever he was asked why he was late for class, he would answer carelessly, always ________ the

same thing.[ ]

A．saying  

B．said

C．to say  

D．having said

随着珠江三角洲地区__________的增多和__________的提高，__________、劳动力成本上涨，加上远离_________，__________储备不足，使得这里吸引外资的优势渐失。