问题
选择题
Until recently historians assumed that calendars ________ with the advent of agriculture.[ ]
A. came to existence
B. came to exist
C. were existed
D. were existential
答案
答案：B
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Until recently historians assumed that calendars ________ with the advent of agriculture.[ ]
A. came to existence
B. came to exist
C. were existed
D. were existential
答案：B