Mary___________ computer science last year.
#42215
A
studies
B
studied
C
will study
D
studying
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Great changes _________ in Tongren in the past five years.
#42335
A
have happened
B
have taken place
C
have been happened
D
have been taken place
---What do you usually do when it is raining?---I often ______ TV. 
#39810
A
are watching
B
watch
C
watches
D
watching