A two-year-old girl named Niu Niu, _______  falling from the IOth floor of a building, was caught by a "super-mother" Wu Juping with her bare arms.
#95143
A
having been noticed
B
noticing
C
being noticed
D
having noticed
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 _____ what would happen,none of them could find a way out. 
#90766
A
Left wondering
B
Having left wondering
C
Leaving to wonder
D
Having left to wonder
Each button, when ____, provides a piece of beautiful music.
#88692
A
clicked
B
having clicked
C
clicking
D
being clicked