问题
选择题
单项选择。
— What's John doing now?
— He ______ a letter. [ ]
A.is writing
B.are writing
C.is writening
D.be writing
答案
答案：A
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单项选择。
— What's John doing now?
— He ______ a letter. [ ]
A.is writing
B.are writing
C.is writening
D.be writing
答案：A