Up to now, no one has come up with a（n） explanation of why dinosaurs died out, and it remains a mystery．
#11239
A
astonishing
B
amusing
C
convincing
D
puzzling
推荐题目
His wife is constantly finding ______ with him, which makes him very angry.
#12074
A
errors
B
shortcomings
C
fault
D
flaw
—John，when shall we meet again，Thursday or Friday?— ．I'll be off to London then．
#10912
A
Either
B
None
C
Both
D
Neither
When we are getting excited, angry or scared, our bodies also ______many physical changes.
#13005
A
go over
B
go around
C
go through
D
go far
Is this the recorder you want________?
#12260
A
to have repaired
B
to repair it
C
to have it repaired
D
it repaired