Look, so many people are running out of the station. I wonder what ________.
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A
is happened
B
was happening
C
is happening
D
had happened
推荐题目
There ______ an English party tomorrow evening.
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A
will be
B
has
C
will have
D
will has
So far, most of the work _______ by others, it’s your turn to do the rest of it. 
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A
has finished
B
finished
C
has been finished
D
is finished
Our teacher told us that light _____ much faster than sound.
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A
traveled
B
travels
C
is traveling
D
was traveling
You won’t have the chance to succeed when you ________.
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A
gave up
B
give up
C
will give up
D
are giving up