核心问题
“You've been very busy lately.”
"So busy I haven't had time to clean my house. There's ____ wherever you look." A. dust B. dusty C. the dust D. a dust (TOEFL)
dust 系物质名词, 是不可数的, 为什么试题要求选 D(a dust)?
词典解答
当dust作“尘土”解时，它是不可数的，因而不能加不定冠词a。但是，当dust作“一阵尘土”“一层尘土”解时，前面应加不定冠词a。例如：
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The car raised quite a dust as we drove off. (LDCE) 当我们驱车离开时,汽车扬起一阵尘土。
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You needn't kick up a dust over such a small matter. 你用不着为这样一件小事大吵大闹。