单项选择题

The librarian has requested that any ______ books or periodicals be returned by the end of the month.

(A) overdue
(B) spacious
(C) vulnerable
(D) previous

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单项选择题

Ms. Andrew had difficulty understanding ______ the customer was trying to communicate to him,

(A) how
(B) what
(C) whether
(D) why

单项选择题

Membership points earned at K-Mart are not transferable to K-Clothing Outlets, as they are two ______ businesses.

(A) isolated
(B) detached
(C) independent
(D) unrelated

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