1.1Which of the following statements are right to define a long sentence?

A. complicated grammatical structure（语法结构复杂）.
B. many modifying elements（修饰成分较多）.
C. complex sentences with two content hierarchies, or above （内容在两个或两个以上的复合句）.
D. simple sentences with numerous meanings（含义较多的简单句）.