15．You may the textbook if you don’t know the answer to the question.A. refer toB. deal w

问题补充：

15．You may the textbook if you don’t know the answer to the question.

A. refer to

B. deal with

C. look up

D. look into

答案：

(答案→)A. refer to

B. deal with

C. look up

D. look into

解析：可联系答案网客服索取。