问题
选择题
At present, there is little doubt _____ short message plays an increasingly important role in our lives.[ ]
A. whether
B. if
C. that
D. which
答案
答案：C
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At present, there is little doubt _____ short message plays an increasingly important role in our lives.[ ]
A. whether
B. if
C. that
D. which
答案：C