题目内容

u______ n. the state of being the only one of its type

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i______ v. to suggest that sth. is true without saying this directly

She followed the receptionist down a luxurious corridor to a closed door, ________ the woman gave a quick knock before opening it.

A. on which
B. but when
C. wherein
D. then

l______ adj. in a basic meaning of a word

i______ n. lack of interest or concern