The students took the trouble all the leaves away.
A. to clean, fallen
B. to clean, falling
C. cleaning, falling
D. cleaning, fallen
网友回答
A. to clean, fallen
B. to clean, falling
C. cleaning, falling
D. cleaning, fallen
解析：学生们不怕困难尽力扫除落叶。take the trouble to do sth. 不怕麻烦或困难尽力做某事。falling leaves: 正在飘落的叶子。现在分词表示正在进行的动作。fallen leaves: 落在地上的叶子。过去分词表示已经完成的动作。故答案为A.