Some plants are very_______to light；they perfer the shade．

单项选择题The children all turned_______the famous actress as she entered the classroom．

A．looked at
B．to look at
C．to looking at
D．look at
点击查看答案

单项选择题His sister left home in 1998，and_______since．

A．had not been heard of
B．has not been heard of
C．had not heard of
D．has not heard of
点击查看答案