问题
选择题
This young tree could not have been damaged ______accident; I believe it was done _____ purpose.
A．by; on
B．for; with
C．by; with
D．for; on
答案
答案：A
考查短语：by accident 偶然地，无意地，on purpose 故意的，句意：这可小树不可能是偶然被毁坏的，我认为它是被故意毁坏的。所以选A。