Mother is cooking something in the kitchen. From that familiar s

Mother is cooking something in the kitchen. From that familiar smell, I know it ( ) be roast beef.
A、might
B、can
C、could
D、must
【正确答案】：D
【题目解析】：must 强烈肯定推测。句子含义是妈妈在厨房做饭，从这熟悉的香味判断，我肯定是烤牛肉。