题目内容
The split between humans and living apes is thought by some scholars _____ 15 to 20 million years ago.
[ ]
A. to occur
B. occurring
C. to have occurred
D. having occurred
B. occurring
C. to have occurred
D. having occurred
C
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The split between humans and living apes is thought by some scholars ____ 15 to 20 million years ago.
|
A.to occur |
B.occurring |
C.to have occurred |
D.having occurred |