It _______ them two weeks _______ the computer last year.

A．takes; to work on

B．spends; working on

C．took; to work on

D．spent; working on

电子商务立法所涵盖的范围是“电子商务通讯手段”和（）交集。

A.支付

B.交易

C.商务

D.营销