1．(2012·江苏，35)—Happy birthday!
—Thank you! It's the best present I ________ for.
A．should have wished
B．must have wished
C．may have wished
D．could have wished
答案：D should have done意为“本应该做”；must have done意为“一定做过”；may have done意为“可能做过”；could have done意为“本能够做，本可以做”。根据句意判断应选D项，表示“这是我能够希望得到的最好的礼物”。
2．(2012·陕西，23)l ________ thank you too much for all your help to my son while we were away from home.
A．won't B．can't
C．can D．will
答案：B 句意：在我们不在家期间，你对我儿子的帮助我感激不尽。can not或can never
