I think _____ a foreign language is not easy ,You should ____ it oftenA.to learn ;to practice B.learning; pratice C.learn; praticing D.learns;to pratice 选哪个,为什么啊 think后面的动词用什么形式啊.

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I think _____ a foreign language is not easy ,You should ____ it often
A.to learn ;to practice B.learning; pratice C.learn; praticing D.learns;to pratice 选哪个,为什么啊 think后面的动词用什么形式啊.

B
should 后面应该跟动词原型,而只有B符合