Don’t worry. There is time left.A. a littleB. a fewC. littleD. few

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(答案→)A. a little
B. a few
C. little
D. few
解析：few和a few用以修饰可数名词,前者一般表示否定意义,后者表肯定;little和a little用以修饰不可数名词,前者表否定,后者表肯定.根据句意可知还有一点时间故选A。