How many______do you have altogether?

How many______do you have altogether?
A、pieces of luggage
B、pieces of luggages
C、piece of luggages
D、piece of luggage
【正确答案】：A
【题目解析】：A. pieces of luggage - 这是正确的形式。因为“luggage”是不可数名词，所以我们用“piece”作为量词，并用复数形式“pieces”来表示多件行李。