问题
选择题
What _____the forests of the USA in the past 30 years? [ ]
A. has happened to
B. is happened to
C. has happened at
D. is happening
答案
答案：A
搜题请搜索小程序“爱下问搜题”
What _____the forests of the USA in the past 30 years? [ ]
A. has happened to
B. is happened to
C. has happened at
D. is happening
答案：A