英语单选题,It is not very easy____math____It is not very easy____math____A.learn,good B.to learn,well C.learn,well D.to learn,求教

问题描述:

英语单选题,It is not very easy____math____
It is not very easy____math____
A.learn,good B.to learn,well C.learn,well D.to learn,
求教

B
it's +adj.+ to do sth
修饰动词用副词.