15.-How about the book you are reading -Good ,indeed .It ________many problems we have come across in our study.A.says B.talks C.covers D.refers
问题描述：
15.-How about the book you are reading
-Good ,indeed .It ________many problems we have come across in our study.
A.says B.talks C.covers D.refers
答
c
答
c
包括的意思
BD要加介词talk about
refer to
say不合适