问题补充:
—— What are you doing? —— I a letter to my pen pal.
A. write
B. am writing
C. writes
D. am write
答案:
A. write
(答案→)B. am writing
C. writes
D. am write
解析:此题考查现在进行时态。根据问句的意思你正在干什么,可知答语也应用现在进行时态,所以选B。
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