单项选择题

Customers seem to have been quite contented with the features of the new mobile phone ______ in July.

(A) introduce
(B) introduced
(C) introducing
(D) introduction
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单项选择题
The companies deliver products faster at lower costs and are better able to compete ______ anyone in the world.
(A) for
(B) against
(C) to
(D) through
单项选择题
Rebates are ______ after purchase at regular sticker prices.
(A) redeemable
(B) refundable
(C) regretful
(D) retrospective
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