How often does the event take place？A．Every monthB．Every six monthsC．Every yearD．Every two

How many years does it take for a student to do a Bachelor degree in the U.K.？A.4B.2C.

How does Hillary Clinton think about the merit pay？A．She is planning to cancel the merit p

How many years does it usually take for a student to do a Master degree in the U.S.？A.

How long does it take to cover the workbook material？A．For more than a term.B．For less tha

How long does it take for the runners to cross the starting line in recent Marathon races？

How often should the man take the medicine？A．Three times a day with meals.B．Three times a