【正确答案】 C

【答案解析】主句是there be句型，而且是肯定句，加上主句使用了现在完成时，因此，反意疑问部分要使用hasn’t there。例如：There have been a lot of explanations as to the causes ofpanic attacks，haven’t there?关于恐惧症的起因，有好多种解释，不是吗?There has beennotable progress in economic cooperation between the two countries，hasn’t there?两国间的经济合作有了显著进展，不是吗?