Mary was heard ----just now .what happen?Johe was telling a joke .A.cry Bto cry C,laugh D.to laugh为什么?

Mary was heard ----just now .what happen?Johe was telling a joke .A.cry Bto cry C,laugh D.to laugh为什么?
Mary was heard ----just now .what happen?
Johe was telling a joke .
A.cry Bto cry C,laugh D.to laugh为什么?

Mary was heard ----just now .what happen?Johe was telling a joke .A.cry Bto cry C,laugh D.to laugh为什么?
hear+宾语+补语{do---------------只有是DO时,被动式才加TO
{doing
{done
此题换成主动句式,应为hear Mary laugh .所以被动式还原To.此题选D.
根据语意排除的AB.
类似单词有see listen notice feel observe make let have
原题干出现错误,应为What happened?

B
不定式
hear sb doing/do sth
sb was heard doing/to do被动语态

C
第二句说，johe 说了个笑话，首先排除AB哭泣， D，tolaugh 是去笑， 与时间状语不符合，选C

选C.
首先根据语境判断，既然是在说笑话就不可能是在哭，所以排除A和B,另外某人被看到（be seen）或者被听到（be heared)后面只接两种形式，一种是原型，一种是ing形式。

Mary was heard to laugh just now.玛丽刚刚听了之后在笑。
因为Johe was telling a joke。 Johe讲了一个笑话，所以玛丽听了之后是笑，不是哭，排除A和B，玛丽是被听的，这里用的是被动语态，动词不定式的TO在这里不能省略。故选D。

都不对。
应该是
Mary was heard laughing just now
被动语态第一个动词heard为过去式，而第二个laugh应该为ing形式。