only after he has acquired considerable facility in speaking __
问题描述：
only after he has acquired considerable facility in speaking __
A:then he learns reading and writing
B:does he learn to read and write
C:finally comes reading and writing
D:he began to read and write
求详解拉
答
选B.句首Only引导的状语从句,紧跟Only的那半句,即状语部分无需倒装,而主句则需要倒装,已知主句里谓语动词为实义动词,且主语为第三人称,则借助助动词do变形does提前,而谓语动词为原形.