问题描述：
英语破折号问题
1.American English—a companion of British English—had become a major variety of regional English in North America.
2.American English,a companion of British English,had become a major variety of regional English in North America.
这2句中,不同的只是标点符号.第二句把第一句破折号的地方改成了逗号.第二句是完全正确的.但不知道第一句的破折号这样用正不正确.如果不正确该怎么改(第一句一定要用上破折号该怎么改)
1.American English—a companion of British English—had become a major variety of regional English in North America.
2.American English,a companion of British English,had become a major variety of regional English in North America.
这2句中,不同的只是标点符号.第二句把第一句破折号的地方改成了逗号.第二句是完全正确的.但不知道第一句的破折号这样用正不正确.如果不正确该怎么改(第一句一定要用上破折号该怎么改)
问题解答：
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