I haven't seen Mr.White for weeks.— What _____ to him?A.must have happened B.may have happened C.can have happened D.may happen从题意可知,空格填表推测过去的选项,除d,而must+have+done在否定和疑问句是用can代替must,除a.但

I haven't seen Mr.White for weeks.— What _____ to him?A.must have happened B.may have happened C.can have happened D.may happen从题意可知,空格填表推测过去的选项,除d,而must+have+done在否定和疑问句是用can代替must,除a.但
I haven't seen Mr.White for weeks.
— What _____ to him?
A.must have happened B.may have happened
C.can have happened D.may happen
从题意可知,空格填表推测过去的选项,除d,而must+have+done在否定和疑问句是用can代替must,除a.但剩下的b和c都能可以,且may和can也有相同的意思,如何判断哪个啊?
What's wrong with your pen'?
— The ink ____ come out.
A.can't B.doesn't C.hasn't D.won' t
这题完全摸不着头脑,请给点好的解释吧

I haven't seen Mr.White for weeks.— What _____ to him?A.must have happened B.may have happened C.can have happened D.may happen从题意可知,空格填表推测过去的选项,除d,而must+have+done在否定和疑问句是用can代替must,除a.但
1C
can 用于否定和疑问；may,must用于肯定
2B 一般现在时

1B
2B

1C 疑问句用can表示推测
2B 时态题。笔怎么了?不出水了。

1 A
must表示肯定，肯定有事。
can表示可能性，可以有事。
may表示猜测，可能有事。
根据上下文，因为好些天没见到white了，所以，肯定发生了什么了。
2 B
固定用法，什么东西坏了就是 sth. doesn't work.