21. After graduation I went to Somalia. When I first set foot on strange land, I didn’t know what the future had in store for me.
A. 不填; a B. the; the C. the; 不填 D. the; a
22. The US Army suffered a record 32 suicides in July 2011, the most ______ it began publishing monthly figures in 2009.
A. since B. when C. while D. though
