问题
Do you know_______ the books on the shelves— Sorry, I can’t count them, because there are _______books.
A:a number of; the number of
B:a number of; a number
C:the number of; a number of
D:the number of ,a number;
B:a number of; a number
C:the number of; a number of
D:the number of ,a number;
正确答案是：
