一个外国游客用刀叉吃水饺，将肉馅和皮儿分别放在两个盘子里。然后一口皮儿一口馅儿地吃，他认为要是配上果酱和奶油就更好了。这个事例说明[ ]

A、外国游客不会吃中国的饺子

B、中国饺子有了新的吃法

C、饮食习惯的不同，体现了文化的差异

D、饺子加上奶油和果酱味道更为独特

I was on the highway when this car went past followed by a police car.They _______ at least 150 kilometers an hour.

A．should have been doing

B．must have been doing

C．could have done

D．would have done