Every year he ________ to Beijing to visit his teacher.
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A
have come
B
comes
C
came
D
come
推荐题目
Computers ____ in offices and homes since 1970s. 
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A
have been used
B
had been used
C
was used
D
has been used
 No one _______ the building without the permission of the policeman.
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A
is leaving
B
will be leaving
C
has left
D
is to leave