英语选择题（大多关于语法）

英语选择题（大多关于语法）
1.——Aric,What are you doing there?
____I am ------my friend overcome difficulties in his study.
A.thinking helping B.considering to help C.thinking to help D.considering helping
2.Do you know his difficulty he had----------four children at school?
A.to have kept B.having kept C.keeping D.to keep
3.One tree after another went down,cut down by the water,which------4 meters deep.
A.must have B .must have been C.can be D.can have been
4.--------is no longer as easy as it was in the past.
A.To choose what to eat B.Choose what to eat
C.Choosing to eat what D.Choosing what to eat
注：请务必说明选择的原因