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
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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
单项选择题
Thanks to wireless LAN technology, it is possible for our employees to work ______ they are, regardless of their current location.
(A) whenever
(B) whoever
(C) whatever
(D) wherever
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