问题
选择题
We know the boy______ from England, but where_______ his mother come from?[ ]
A. am; do
B. is; is
C. are; does
D. is; does
答案
答案：D
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We know the boy______ from England, but where_______ his mother come from?[ ]
A. am; do
B. is; is
C. are; does
D. is; does
答案：D
，k值为（）。