Susan may have missed her train in case she won’t arrive for another hour.A. thatB. what

问题补充：

Susan may have missed her train, in case she won’t arrive for another hour.

A. that

B. what

C. which

D. whose

答案：

A. that

B. what

(答案→)C. which

D. whose

解析：考察定语从句。本题定语从句的先行词是指前面一句话的内容，which case就是指代前面这句话的内容，做介词in的宾语。That不能放在介词的后面，what不能引导定语从句，whose不能指代一句话的内容。句意：Susan一定错过了她的火车，在这种情况下，他再过一小时也到不了。故C正确。