______ is no need for primary students to work at their desks all the long.

A．There

B．What

C．It

D．That

下列日期表达式错误的是

A．{^2004/03/09}+15

B．{^2004/02/25}+date()

C．{^2004/03/09}-15

D．{004/02/25^}-date()