Our country _______ a lot in the last fifty years. 
#38761
A
will change
B
changed
C
changes
D
has changed
推荐题目
 Tom ________ a letter from Terry for a long time.
#42664
A
didn’t receive
B
hasn’t got
C
didn’t have
D
hasn’t heard
While Ann ___ TV, her father came home.
#41786
A
is watching
B
was watching
C
watch
D
watches
Mr. Wang told us that the moon ______ round the earth.
#39997
A
traveled
B
travels
C
traveling
D
travel