My newly-purchased magazine is nowhere to be found.____ I left it on the train?
问题描述：
My newly-purchased magazine is nowhere to be found.____ I left it on the train?
A.Must
B.Should
C.Would
D.Could
为什么选D?
答
表猜测.could /can表猜测用于否定句和疑问句中.在这句话中的意思是“我把杂志放在/忘在列车上了吗?”