单选题 —Jenny took the 8:00 bus to Beijing this morning.
—Really? She ______ the 9:00 train. It's more comfortable and safer to travel by train.
  • A. could take
  • B. must take
  • C. could have taken
  • D. must have taken
【正确答案】 C
【答案解析】[解析] 第一句意为“詹妮今早乘坐8点的巴士去了北”。第二句意为“真的吗?她乘九点的火车，坐火车去更舒服，也更安全”。could have done 用来表示本来可以做某事(而实际上却没有做)，符合题意，故选C。