—How long have you ________ there?
—About four years.[ ]
A. come
B. gone
C. left
D. worked
答案:D
[听力原文]金刚石独一无二的特性是什么?()
A.漂亮
B.名贵
C.最硬
D.有金光
暴风、暴雨的标准是什么?