问题
选择题
Almost all English prepositions ______ look like verbs.
A．when they turn into Chinese
B．when turning into Chinese
C．when they turned into Chinese
D．when turned into Chinese
答案
答案：D
本题考查分词作状语，逻辑主语为English prepositions，与turn into之间的关系为被动关系，故用过去分词，选D。