Prep語法筆記第135題

[positivegal]

135. Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.
A. which, causing plant and animal extinctions, marks
B. which caused the plant and animal extinctions marking
C. and causing plant and animal extinctions that mark
D. an event that caused plant and animal extinctions, and it marks
E. an event that caused the plant and animal extinctions that mark

答案是E
請問E的兩個that沒有指代不清的問題嗎?

嗚我發現指代是我的致命弱點!

[gozui[origen]]

第一個that是指event
第二個that是指extinctions
指涉清楚