小丽4次数学测验平均成绩是88分，为了使平均成绩尽快达到91分以上，她需要再考（ ）次100分。
2
The boy has been looking forward to____his present for a whole day, so now he is
looking forward to____whether his father is back home. [ ]
A. see; seeing
B. seeing; seeing
C. seeing; see
D.see; see
化简：2（x2y+xy）-3（x2y-xy）-4x2y．
