The Yangtze is the longest river in China, _____which some more bridges have been built in the past few years.
问题描述：
The Yangtze is the longest river in China, _____which some more bridges have been built in the past few years.
A. onto B. through
C. above D. over
选哪个,解释以下原因
答
D.over
which 指的是 Yangtze （长江）
桥在河上,介词用 over
请看例句：
There is a broken small old gray stone bridge over the river.
河上有一座破烂不堪的,古老的,灰色的小石桥.