—Is Jack on duty today?—It be him. It’s his turn tomorrow.A. mustn’tB. won’t C. can’tD. ne

问题补充：

—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

答案：

A. mustn’t

B. won’t

(答案→)C. can’t

D. needn’t

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