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
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Sally took a photo of her friends while they _________ computer games.
#39111
A
play
B
are playing
C
have played
D
were playing
Trees and flowers ________every year to make our country more beautiful. 
#36894
A
is planted
B
was planted
C
are planted
D
were planted
I _______my teacher since last year. I miss him very much.
#41560
A
didn’t see
B
saw
C
haven’t seen
D
see