单项选择题

Children under the age of twelve are not permitted to watch this program ______ guided by their parents.

(A) but
(B) otherwise
(C) without
(D) unless
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单项选择题
The Ropes family is going to have an opportunity to ______ their relatives in Mexico.
(A) arrive
(B) look
(C) travel
(D) visit
单项选择题
My advice is not to pay your key deposits in full ______ everything is signed.
(A) whichever
(B) as though
(C) until
(D) otherwise
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