Mr. Green and Mr. King have taught English at Beijing Sunshine Secondary School they came to China two years ago.
A. since
B. as
C. for
D. until
网友回答
(答案→)A. since
B. as
C. for
D. until
解析：since由于,自从……以来；as作为，由于；for为了，因为，对于；until直到。句意：自从他们两年前来到中国，格林先生和金先生就在北京阳光中学教英语。结合语境可知选A。