我国对外开放的核心和重点是( )。

A．发展对外开放

B．利用国外资金；

C．引进先进技术

D．兴办经济特区

Woman: Did you really work all of these problems without any help from the book
Man: Well, most of them anyway.
Question: What does the man imply（）。

A. Most of the problems were in the book.

B. He did need help on a few problems.

C. There’s more than one way to do the problem.

D. There were really too many problems to do: