therefore
1.therefore前没有and时,前面用分号,如He was busy, and therefore could not come里用逗号,但He was busy, therefore he could not come里最好用分号。
2.在口语里很少用therefore,通常用that's why。
therefore
1.therefore前没有and时,前面用分号,如He was busy, and therefore could not come里用逗号,但He was busy, therefore he could not come里最好用分号。
2.在口语里很少用therefore,通常用that's why。
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