We all know that learning a foreign language _______ time and effort.
A．requiresB．reducesC．removesD．repeats
A

試題分析：句意：我們都知道學習一門外語需要時間和努力。 A. requires 需要；B. reduces 減少；C. removes 出去；D. repeats重復。結合常識，學習語言是需要時間和努力的。故選A。
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