单项选择题

He began to work ______ the age of 18.

A. on
B. in
C. at
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单项选择题
What a pity. The concert tickets have ______.
A. sold out
B. been sold out
C. been sold well
单项选择题
—You have decided to visit the Great Wall on Sunday, right —______.
A. OK
B. You said it
C. Not at all
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