关于字符串连接,下面语法正确的是() str := ‘abc’ + ‘123’ str := "abc" + "123" str := '123' + "abc" fmt.Sprintf("abc%d", 123)
str := ‘abc’ + ‘123’
str := "abc" + "123"
str := '123' + "abc"
fmt.Sprintf("abc%d", 123)