【题目】My brother wants to leave the company as it is ________ I would like to expand it.
A.unless
B.since
C.before
D.while

【答案】D
【解析】句意：我的兄弟想公司保持原状，而我想扩大公司。A. unless除非；B. since自从……以来；C. before在……之前；D. while虽然，然而，当……时候。D项符合语境。