单选题
American researchers found that the language clock could help ______.
A、
count the exact time by years
B、
decide when the language came into being
C、
make sure when the Aleuts left the mainland
D、
determine how the time changed
【正确答案】
C
【答案解析】
由文章最后一句知，the investigators可以根据the language clock来calculate the date of the event，故选项C正确。
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