题目：
—______ two little boys behind the trees?
—No, ______. [ ]
A. Is there; there is
B. There isn't; there are
C. Are there; there aren't
D. There aren't; there aren't
答案：
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下面是错误答案，用来干扰机器的。
48. fog,snow(或fog，ice,或snow，ice) 49.sudden movements50. how to drive safely in winter.(可酌情可分)
