—Such a mistake could have been avoided. —Unfortunately, he _______ the mistake again and again.
#104834
A
repeated          
B
would repeat
C
had repeated        
D
would have repeated
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It is believed that many more popular terms ________ on the Internet this year.
#102874
A
will be created
B
have created
C
are created
D
are creating
-----What _____?-----I______my key and can't open the door. 
#104186
A
happened, lost
B
has happened, lost
C
happens, have lost
D
has happened, have lost