问题
选择题
There is a new problem involved in the popularity of private cars ________ road conditions need ________.
A．that；to be improved
B．which; to be improved
C．where；improving
D．when；improving
答案
答案：A
因为“公路状况需要改善”，“need”后接“improving”或“to be improved”都可以。后面的从句应是“problem”的同位语，应用“that”引导。