问题
选择题
---Is ________ mother a teacher? ---Yes, and Lucy and Lily are .
A．Lucy and Lily’s, twin sisters
B．Lucy and Lily’s, twin sister
C．Lucy’s and Lily’s, twin sisters
D．Lucy’s and Lily’s, twin sister
答案
答案：A
在表示两个人共有某个东西时，’s要加在最后的那个人后面，Lucy and Lily 是复数，故选A