Question

【题目】—— What are you doing? —— I _____ a letter to my pen pal.

A. write B. am writing C. writes D. am write

Answer 1

【答案】B

【解析】本题的问句问得是进行时态的结构，故回答语也应该用进行时态的结构，结构为be+doing，故本题选B。