试题题干
Translate the following sentence into Chinese.
Auction sites have been spring up all over the Internet, but the undisputed leader is eBay.
参考答案
试题解析
考点：auction sites拍卖网站；spring up突然出现；the undisputed leader领军者。
句子结构：句子为but连接的并列句。前半句为现在完成进行时态，后半句为一般现在时。