-Someone’s knocking at the door. Is it your mother?
-No, dad. It _____be mom. I saw mom ____in the bedroom just now.
| A．must, sleep | B．may, sleeping |
| C．needn’t, sleep | D．can’t , sleeping |
-Someone’s knocking at the door. Is it your mother?
-No, dad. It _____be mom. I saw mom ____in the bedroom just now.
| A．must, sleep | B．may, sleeping |
| C．needn’t, sleep | D．can’t , sleeping |
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