A recent survey about“shanzhai”culture conducted by China Central Television    that 50％ of the netizens support for it．

A．shows

B．to show

C．showing

D．to have shown

《招标投标法》规定，招标人和中标人应当自中标通知书发出之日起( )日内，按照招标文件订立书面合同。

A．20

B．28

C．30

D．35