题目

If you had worked hard, you ______ so anxious now．        A．are not                    B．would not have been        C．will not be              D．would not be 答案：D酵母菌与细菌相比，在结构上的主要不同是（　　）A．单细胞B．不含叶绿素C．不具鞭毛D．有成形的细胞核