—Must I finish the book today?

—Yes, you ________, but you ________ finish it now. Have a rest.

A．do; don’t have to

B．do; mustn’t

C．must; don’t have to

D．must; mustn’t

下列不属于施工定额特征的是( )。

A．编制概算指标的基础

B．企业定额

C．分项最细、定额子目最多

D．基础性定额