Don’t stand up until you ____________.
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A
tell to
B
are told
C
are told to
D
are told to do
推荐题目
The light bulb ______ by Edison in the middle of the 1780s.
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A
is invented
B
was invented
C
invented
D
invent
The mayor is happy to find that many trees _______ in our city last year. 
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A
plant
B
were planted
C
planted
D
are planted
Her life ____________  a lot in the last few years.
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A
changed
B
is changing
C
has changed
D
have changed