中文谷Scientistthinkthere
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问题详情：
Scientist think there ________ life on the earth for millions of years.
A. was B. has been C. have been D. has
【回答】
B
知识点：动词时态
题型：选择题
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问题详情：
Scientist think there ________ life on the earth for millions of years.
A. was B. has been C. have been D. has
【回答】
B
知识点：动词时态
题型：选择题
