题目内容
The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
A. until B. though
C. because D. Unless
练习册系列答案
相关题目
题目内容
The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
A. until B. though
C. because D. Unless