At present，there is little doubt ________ short message plays an increasingly important role in our lives．
#69112
A
whether
B
if
C
that
D
which
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I walked up to the top of the hill with my friends, ______ we enjoyed a splendid view of the lake.
#68395
A
which
B
where
C
who
D
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The teacher left word with our monitor _____ she would explain the problem again next time.
#67921
A
who
B
which
C
as
D
that