He could speak English fluently because he __________ it for four years when he was a college student.    
#101396
A
had studied
B
have been studying
C
studied
D
was studying
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--- _____ the change of the schedule ______?--- Oh, God! I forgot all about it. I’ll do it right now.
#100466
A
Has, been announced
B
Was, announced
C
Has, announced
D
Had, been announced
Excuse me.I ________ I was blocking your way.
#99576
A
didn't realize
B
don't realize
C
haven't realized
D
wasn't realizing