问题
选择题
Scientists estimate that plants and animals lived _____ 3.5 billion years ago. [ ]
A. as far as
B. as many as
C. as long as
D. as old as
答案
答案：C
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Scientists estimate that plants and animals lived _____ 3.5 billion years ago. [ ]
A. as far as
B. as many as
C. as long as
D. as old as
答案：C