The party had to be ______ becau

The party had to be ______ because the host went down with a bad case of flu.
A、called in
B、called off
C、called on
D、called up
【正确答案】：B
【题目解析】：call off取消；call in召集；call on访问，拜访，请求，号召；  call up打电话，召集，提出句意：派对必须取消，因为主持人患了严重的流感病倒了。