请选择CBA'g+g7K0F'n.K,M7N2m I have many story-books.:w*c;N(],n9t2S(v6y4Z.v/})y;L8b.r*q
A.Are they in the study?:w*c;N(],n9t2S(v6y4Z.v/})y;L8b.r*q
B.are they in the study.:w*c;N(],n9t2S(v6y4Z.v/})y;L8b.r*q
C.They are in the study?:w*c;N(],n9t2S(v6y4Z.v/})y;L8b.r*q