Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.
#62591
A
must have happened
B
would have happened
C
should have happened
D
might have happened
推荐题目
—Isn’t Ann’s husband over there? —No, it _____ be him — I’m sure he doesn’t wear glasses.
#62563
A
can’t
B
must not
C
won’t
D
may not
Jenny doesn’t agree with her father, but she ________ that to his face.
#63121
A
dare not to say
B
doesn’t dare to say
C
dares not say
D
dare not saying
----Whose book is this?----It _______ our geography teacher’s. You see, his name is on it.
#75405
A
can’t be
B
can be
C
mustn’t be
D
must be
–What will the weather be like tomorrow? –It____ be rainy, cloudy or sunny. Who knows?
#74825
A
must
B
might
C
shall
D
should