—A ruler is 2 dollars and a pen is 3 dollars. How much are they? —They are ________. A. $2 B. $3 C. ...
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题目内容：
—A ruler is 2 dollars and a pen is 3 dollars. How much are they?
—They are ________.
A. $2 B. $3 C. $4 D. $5
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