_____ angles of any triangle always add up to 180 degrees.A.If three B.The three C.Three of D.Three are

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_____ angles of any triangle always add up to 180 degrees.A.If three B.The three C.Three of D.Three are

_____ angles of any triangle always add up to 180 degrees.A.If three B.The three C.Three of D.Three are
_____ angles of any triangle always add up to 180 degrees.
A.If three B.The three C.Three of D.Three are

_____ angles of any triangle always add up to 180 degrees.A.If three B.The three C.Three of D.Three are
答案B 注意B. The three中的定冠词,完全符合语法规则.查看原帖>>