评论
打印
A)N was probably Mr. Brown' s phone number that the woman wrote down.
B)It was just an hour ago that the man met Mr. Brown.
C)The woman forgot to write down the phone number.
D)The woman needed a sheet of paper to put down the number.
n. 痕迹，踪迹，微量
vt. 追踪，找出根源
