21． ______ to sunshine for too much time will do harm to one’s skin.
A. Exposed B. Having exposed
C. Being exposed D. After being exposed
22. When I was in hospital, my mother promised me that she would take me to Qingdao ______ I was well enough to travel, which ______ my recovery.
A. direct; contributed to B. direct; attributed to
C. directly; attributed to D. directly; contributed to
