题目内容：

this piece of music _____ Beethoven,it is still popular with people today
填写being composed by,为何是这种形式?

优质解答

在英语中一个完整的句子中是没有逗号,除非该句中有连词把各成分或者两个分句连接到一起.在this piece of music _____ Beethoven,it is still popular with people today.句子中没有连词,而且有逗号,所以该逗号就是在...