听力原文： Algerian police, looking for three kidnapped French nationals, are searching veh

icles at roadblocks in downtown Algiers. The van used in Sunday's kidnapping was found abandoned in the area. An Algerian police chief says the cap tires may still be alive. Seven foreigners have been killed over the last month by suspected Moslem extremists fighting to topple the government. France is urging families of French nationals in Algeria to come home

The kidnapping took place ______.

A．on Sunday

B．last month

C．when the van was found

D．before seven foreigners were killed