下列句子的标点符号运用有错误的一项是[ ]

A、桃树，杏树，梨树，你不让我，我不让你，都开满了花赶趟儿。

B、“嗨，慢着，”我软弱地哀求道，“我没法——”

C、乌云蔽月，她便紧张不安，惟恐宝藏丢失；满月缺损，她便心痛如割，仿佛遭了抢劫。

D、德高望重的老桥，你在这涧水上站了几百年了？你累吗？

Laura borrowed $240, interest free, from her parents to pay for her college education. If she pays back  percent of this amount quarterly, and has already paid $42.00, for how many months has she been paying back her loan ？