单项选择题

To become skilled in martial arts like karate requires extensive ______ and constant dedication.

(A) train
(B) trained
(C) training
(D) to train
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A growing ______ of countries have signed the international agreement to reduce emissions of greenhouse gases.
(A) file
(B) numeral
(C) list
(D) log
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The company ______ a new policy on employee Internet usage at the start of the year.
(A) formatted
(B) coined
(C) implemented
(D) ascribed
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