【C19】______
A. she discovered
B. she did discover
C. did she discover
D. does she discover
【C16】______
A. released
B. relieved
C. realized
D. regretted
【C20】______
A. above all
B. after all
C. in all
D. at all
【C17】______
A. with regards
B. as to
C. as if
D. as far as