摘要：Whose coat is this?
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—Whose purple coat is this?
—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.
| A．must; may | B．may; must |
| C．can’t; may | D．mustn’t; must |
—Whose purple coat is this?
—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.
A．must; may B．may; must
C．can’t; may D．mustn’t; must
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—Whose purple coat is this?
—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.
—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.
| A．must; may | B．may; must |
| C．can’t; may | D．mustn’t; must |