--The big clock has been used for many years.—Well,--it does

.that's because 那是因为
it's no wonder that 难怪
there's no doubt 后面跟that 而不是if ,毫无疑问
it's unlikely that 这是不可能的
The big clock has been used for many years.—Well,_it's no wonder that _it doesn't work well occasionally.
这个大钟已经用了好多年了.哇,难怪它偶尔会有点坏.
从前后句可以断定答案为B,如果答案C为there's no doubt that的话也正确.
再问： 如果选C该怎么翻译勒？谢
再答： The big clock has been used for many years. —Well,there's no doubt that__it doesn't work well occasionally. 这个大钟已经用了好多年了。哇，毫无疑问它偶尔会有点坏。 大体上没什么问题，不过还是用it's no wonder that 比较恰当通顺。