问题
选择题
What _____ the forest of the USA in the last 350 years?[ ]
A. has happened to
B. is happened to
C. has happened at
D. is happening
答案
答案：A
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What _____ the forest of the USA in the last 350 years?[ ]
A. has happened to
B. is happened to
C. has happened at
D. is happening
答案：A