a language requires time and effort.
A．LearnB．LearningC． To learnD． Being learned
B
現(xiàn)在分詞多表示反復(fù)發(fā)生的事情，不定式表示將發(fā)生的事情，根據(jù)題意學英語要求時間和努力，故用主動語態(tài)。此處應(yīng)選B。
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