—Must I finish my homework first，Mum? —Y...

—Must I finish my homework first，Mum?

—Yes，you________ do anything else before you finish it.

A. may B. should

C. can't D. needn't

C 【解析】句意：——妈妈，我必须先完成作业吗？——是的，在你完成作业之前，你不可以做其他任何事。may可能，表示没有把握的推测；should应该，表示建议；can’t不可以，表示要求；needn’t不必，表示必要性。此处是妈妈要求她在完成作业前，不可以做其他事，故用can’t，故选C。

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