摘要：( )-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
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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
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B. is happened to
C. has happened at
D. is happening