Peter, perhaps John, （） playing with the little dog.
A
seems
B
were
C
are
D
is
答案解析
正确答案：D
解析：
题目解析
题目中的句子是一个关于现在进行时态的陈述句，"Peter" 是主语，"perhaps John" 是插入语，而谓语动词应与主语 "Peter" 一致，所以正确答案是 "is"。句子的正确形式是 "Peter, perhaps John, is playing with the little dog."
