—Shall we go to Australia for the long holiday ?--Sorry. I _______ there twice.
#37531
A
have gone
B
was
C
have been
D
go
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The scientists ________ on the new medicine for two years. They will succeed in no time.
#38384
A
work
B
are working
C
have worked
D
will work
-----Did you notice him come in?-----No. I _____ a football game.
#41746
A
have watched
B
had watched
C
am watching
D
was watching
---Excuse me. Could you wake me up when my friend _______here?---Of course. But we still don’t know when your friend ______ here.
#37922
A
comes;will come
B
comes;comes
C
will come; comes
D
will come; will come