Mum,I'd like to open my present______.I can't wait to know what it is.

问题描述:

Mum,I'd like to open my present______.I can't wait to know what it is.
A.later B.at once C.tomorrow D.next week

B at once 立刻 马上
我想马上打开我的礼物,我不能再等待了.