In the last few years, great changes _________to her, she is not the one that used to be.
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A
happened
B
have been happened
C
have happened
D
were happened
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Jenny will visit me if he ____________ here. 
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A
comes
B
has come
C
came
D
will come
It’s two and a half weeks since the exchange students __________ Wuxi.
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A
arrived
B
reached
C
have been in
D
have arrived in