Question

A tourist will easily lose his way in Beijing ______ he has a map or a guide.

A. if
B. because
C. unless
D. when

Answer 1

答案C
四个选项分别表示如果、因为、除非和当……时候，根据题意选项C为最佳答案，旅行者很容易在北京迷路，除非他有地图或者向导。