The seller told me that I looked grace in the dress, but I take his compliment with a ______of salt because I'm sure he works on commission.
A、little
B、grain
C、lot
D、grains
【正确答案】：B
【题目解析】：考查Unit nouns（单位名词）。固定搭配take with a grain of salt，指对某事半信半疑，持保留态度。
