—How many times ________ Li Yan ________ to the Great Wall?—Twice.
#38217
A
has; been
B
is; going
C
has; gone
D
does; go
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—Where is Jim? —He            home since last week.
#37437
A
has left
B
has gone away from
C
left
D
has been away from
Our country _______ a lot in the last fifty years. 
#38761
A
will change
B
changed
C
changes
D
has changed