A:arrived ; didn’t turn u
B:had arrived ; didn’t turn u
C:arrived ; hadn’t turned u
D:had arrived; hadn’t turned u
Last Sunday, we went swimming in the pool. We enjoyed ____ (we).
Danny can't run fast. He is _______.
目前我国东部沿海城市的人口增长模式主要是( )
“生物圈II号”实验的进行,说明人类可以建造一个适合人类生存的环境。 ( )