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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By the time Jack returned home from England, his son            from college.
#101871
A
graduated
B
has graduated
C
had been
D
had graduated
—Sorry. I ________ to post the letter for you. —Never mind. ________ it myself after school. 
#104473
A
forget; I’d rather post
B
forgot; I’ll post
C
forgot; I’m going to post
D
forget; I’d better post