—Is Jack on duty today?
—It ________ be him. It’s his turn tomorrow.
| A．mustn’t | B．won’t |
| C．can’t | D．needn’t |
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—Is Jack on duty today?
—It ________ be him. It’s his turn tomorrow.
| A．mustn’t | B．won’t |
| C．can’t | D．needn’t |
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