PREP的一道题，有个固定搭配的疑问

never4tw

Nine months after the county banned jet skis and other water bikes from the tranquil waters of Puget Sound, a judge overturned the ban on the ground of violating state laws for allowing the use of personal watercraft on common waterways
A same
B of their violating state laws to allow
C that it violates state laws that allowed
D that it violated state laws allowing
E that state laws were being violated allowing
答案是D。
知道E和C是错的。
但是为什么AB不对呢？on the ground后面必须加that么？还是有其他更神奇的原因~多谢啦先

seeking95

我也很迷惑，求解~
我记得on the ground of是固定搭配啊