my goodness!you - wear slippers at work!^^^^

题目

my goodness!you - wear slippers at work!^^^^
–My goodness!You ___wear slippers at work!
–I`m sorry I forgot to change them for fear of being late.
A.must B.can C.should D.may
为什么选C

答案

should [表示语气较强的假设]万一,竟然
又如：It is simply a miracle that rice should grow in such a place.
稻子竟能在这样的地方生长,这实在是个奇迹.