Why pleasant smells do not reduce pain in man is a question still _______ by scientists.
#97245
A
answered
B
being answered
C
to be answered
D
that answered
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        , he dialed 999. 
#89716
A
Seen the house on fire
B
To see the house on fire
C
Being seen the house on fire
D
Seeing the house on fire
_____ to sunlight for too much time will do harm to one’s skin.
#92287
A
Exposed
B
Having exposed
C
Being exposed
D
to expose
_______ in the war, many children have become orphans(孤儿).
#95733
A
Their parents were killed
B
Being killed
C
Their parents killed
D
Killed