She has mastered English grammar and a_ a large vocabulary without the help of a teacher.首字母填空,

问题描述:

She has mastered English grammar and a_ a large vocabulary without the help of a teacher.
首字母填空,

应该是acquainted ,和master是同位的,意思是 在没有任何老师的帮助下,她了解并掌握了英语语法和大量的词汇,希望能帮到你啊

obtain包含着“努力”、“希望”或“决意”去获得某物的意思。 The She has mastered English grammar and acquired a large vocabulary without

acquaints
她在没有老师的帮助下,精通了英语语法并掌握了大量的词汇.

also