–You speak very good Chinese. --Thanks. I _______ it for 4 years before I came to China.
#103358
A
studied
B
study
C
was studying
D
had studied
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He________Beijing,so he knows a lot about it.
#99171
A
has gone to
B
has been to
C
went to
D
goes to
Three months ____ before we knew it.
#102692
A
passed by
B
went
C
went by
D
past