Peter will cook for his parents the International Day of Families comes.A. unlessB. when

问题补充：

Peter will cook for his parents the International Day of Families comes.

A. unless

B. when

C. until

D. though

答案：

A. unless

(答案→)B. when

C. until

D. though

解析：考查连词的使用，难度适中，当the International Day of Families来临时，Peter将为父母煮饭，答案选B。