I must go to the library today to ________ these books.

I must go to the library today to ________ these books.

A.publish

B.replace

C.buy

D.exchange

答案及解析： D

解析：

我今天必须去图书馆换这些书。exchange交换。publish发表；出版；replace取代；代替，这两项显然不符合题意。