单选题 They left for the airport very early in the morning ______ traffic jam.
  • A.in line with
  • B.at the risk of
  • C.in case of
  • D.for the sake of
【正确答案】 C
【答案解析】[解析] in case of：万一，以防。等于for fear there should be。有时可以省略of和后面的介词宾语。比如：They brought an umbrella just in case. For the sake of：为了……。