---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 |
---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 |
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