过马路时应先看右边。
参考答案:错
–It’s a long time ___ I last saw you.
--Yes, and it will be two months ______ we can meet again.
A.before; since
B.when; before
C.since; when
D.since ; before
圆雕是最常用的一种技术形式,也称剔雕或隐雕。