--- Whose French book is it?
--- It __________ be Lucy’s. Look! Her name is on the book!
| A．must | B．mustn’t | C．might | D．can’t |
--- Whose French book is it?
--- It __________ be Lucy’s. Look! Her name is on the book!
| A．must | B．mustn’t | C．might | D．can’t |
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