Who will teach you to play basketball this summer.

The twins.Because_____ Jim______Jam play it very well.

A．both, and

B．neither,nor

C．either.or

D．not only,but also

（）属于不作为义务。

A．交付贷款

B．运输合同货物

C．保守商业秘密

D．完成加工任务