【題目】We all know that learning a foreign language time and effort.

A. reducesB. requiresC. removesD. repeats

【答案】B

【解析】

句意：我們都知道學(xué)習(xí)一門外語需要時間和努力。考查動詞辨析。A. reduces減少；B. requires要求；C. removes移開；D. repeats重復(fù)。time and effort時間和努力；根據(jù)句意語境，可知ACD三項意思都不合句意，故選B。

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