There must have been a large number of tourists in Sanya during the past Spring Festival

问题补充：

There must have been a large number of tourists in Sanya during the past Spring Festival, ?

A. mustn’t there

B. haven’t there

C. wasn’t there

D. didn’t there

答案：

A. mustn’t there

B. haven’t there

(答案→)C. wasn’t there

D. didn’t there

解析：本题考查反义疑问句。there be句型的反意疑问句的主语永远用there。must的反义疑问句有时间状语，反义疑问部分用过去时态，故选C。