Until recently historians assumed that calendars ________ with the advent of agriculture.
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A
came to existence
B
came to existing
C
came to exist
D
were existential
推荐题目
Do you know how much time and effort they devoted___________such a complicated project ? 
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A
to complete
B
completed
C
completing
D
to completing
Little Johnny felt the bag,curious to know what it ______.
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A
collected
B
contained
C
loaded
D
saved
________ different life today is ________ what it was 20 years ago!   
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A
How; from
B
What a; from
C
What; from
D
How; than