-Hasn’t Zhao Wei finished filming the movie So Young?-Yes. She  ______ on it for more than half a year.
#100089
A
is working
B
has been working
C
worked
D
will have worked
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His sister left home in 1998, and _________ since then. 
#100164
A
hadnotbeenheard
B
hasnotbeenheardof
C
hadnotheardof
D
hasnotheardof
---- You look tired. ---- Yeah, I ________ since 4 o’clock.
#103605
A
had played
B
have been playing
C
am playing
D
have been played