问题补充:
It is very difficult the little boy carry the big box.
A. of; for
B. to; to
C. for; to
D. by; for
答案:
A. of; for
B. to; to
(答案→)C. for; to
D. by; for
解析:固定句式It’s adj for sb to do sth做某事对某人来说怎么样。本句中it是形式主语,真正主语是to do sth,for后面是动作对象。句意:运这个大箱子对于这个小男孩来说太难了。故选C。