【题目】It is not ________ it is useful to study nature but he takes pleasure that the scientist study nature.
A. until B. though C. because D. since
在线课程【答案】C
【解析】
试题分析：句意为：这个科学家研究自然不是因为这样做有用，而是是因为从中得到了快乐。until直到……为止；though虽然；because因为；unless除非。It is not because…but(because)…构成前后形成对称关系的强调句型，故选C。