to be masteredI think it must be to master but the correction is D. I don't understand. Please explain it to me.
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Ti?u C?m Q: Vietnamese is a difficult language___A.for master B.mastering C.in mastering D.to be masteredI think it must be to master but the correction is D. I don't understand. Please explain it to me. ThanksYou are right. D is as unnatural as A, B, and C.