单项选择题

Directions: In this section,there are 10 incomplete sentence& You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. If only I ______ my watch last night!

A. haven’ t lost
B. hadn’ t lost
C. don’ t lose
D. didn’ t lost