The first lady of the USA, Michelle Obama visited China this spring. She with her mother and two daughters     China for a week.
#36166
A
stayed in
B
has been in
C
has been to
D
has gone to
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If you ___him tomorrow,please ask him if he____ to work on the farm with us.  
#40609
A
see,goes
B
will see,goes
C
will see,will go
D
see,will go
 Look! The children ______ in the river.
#39757
A
swim
B
are swimming
C
is swimming
D
swims
—Why didn’t you go to the movie yesterday? —Because I_________it before. 
#42506
A
had watched
B
have seen
C
have watched
D
had seen