问题补充:
----- How about the book you are reading now?
----- Excellent indeed. You can find many problems we have come across in it.
A. covered
B. covering
C. are referred
D. referred
答案:
(答案→)A. covered
B. covering
C. are referred
D. referred
解析:考查非谓语动词。句中covering作宾语补足语,与宾语many problems是主动关系。句意:——你现在看的这本书怎么样?——真好!它涉及/讲了我们学习过程中的很多问题.