She ________ her hairstyle in her hometown before she came to Chongqing for a better job. 
#104792
A
would change
B
has changed
C
changed
D
was changing
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With the development of science, more new technology ______to the field of IT.
#102065
A
has introduced
B
is being introduced
C
is introduced
D
was introduced
He________Beijing,so he knows a lot about it.
#99171
A
has gone to
B
has been to
C
went to
D
goes to