If the homework _______, you can go home.
#37038
A
did
B
has done
C
will be done
D
is done
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Jenny will visit me if he ____________ here. 
#42400
A
comes
B
has come
C
came
D
will come
It’s two and a half weeks since the exchange students __________ Wuxi.
#41945
A
arrived
B
reached
C
have been in
D
have arrived in