At present，there is little doubt ________ short message plays an increasingly important role in our lives．A.whetherB.ifC.thatD.which
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C解析考查doubt用法. there is no doubt that 否定就用thatthere is doubt whether/if 肯定就用whether/if，说明有疑问,后接同位语从句。Little表达否定意思很少的,故选C