I have heard about the teacher____

题目

I have heard about the teacher____
A.rob
B.robbed
C.robbing
D.being robbed
我选的是D但答案是B 求详解
It is one thing to accuse a person of a certain crime,but____
A.proving it is difficult
B.how to prove is diffcult
C.it is hard to prove
D.to prove it is quite another thing
我选的是A但答案是D求详解

答案

hear sb doing 是听见某人正在做某事.此处译为听见老师被抢~
调整下语序,it is one thing to accuse a person of certain crime,but it is quite another thing to prove .