He dropped a ( )and broke it.(tea cup / tea's cup / cup for tea / cup of tea)答案是tea cup,为什么其他不对.

问题描述:

He dropped a ( )and broke it.(tea cup / tea's cup / cup for tea / cup of tea)
答案是tea cup,为什么其他不对.

tea cup 是名词短语,“茶杯 ”的意思.