Is oxygen the only gas _______ helps fire burn? 
#95032
A
that
B
/
C
which
D
it
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In my opinion, the idea of a family is much narrower than ________.
#91968
A
that used to be
B
it used to
C
it was used to
D
it used to be
A new study suggests that the more teenagers watch television,_______ develop depression(抑郁症) as young adults.
#92109
A
the more likely they are to
B
the more likely they are
C
they are the more likely to
D
the more likely are they