问题

Until recently historians assumed that calendars ________ with the advent of agriculture.

A:came to existence
B:came to existing
C:came to exist
D:were existential

正确答案是：

同类题型

er she saw theyoung man, she would feel her heart __________.

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he standard of living for 3 billion people willcreate massive opportunities, XiJinping said at the fifth BRICS summit , and hecalled for major cooperation projects.