it is necessary for us_both reading and writingA.learning B.learned C.learn D.to learn选哪个,理由

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itisnecessaryforus_bothreadingandwritingA.learningB.learnedC.learnD.tolearn选哪个,理由itisnecessaryforus_

it is necessary for us_both reading and writingA.learning B.learned C.learn D.to learn选哪个,理由
it is necessary for us_both reading and writing
A.learning B.learned C.learn D.to learn
选哪个,理由

it is necessary for us_both reading and writingA.learning B.learned C.learn D.to learn选哪个,理由
D 因为 is 是助动词,learn是动词,助动词与动词之间用to相连