There __________ some children in the painting room. They are studying painting. 
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A
is
B
are
C
am
D
was
推荐题目
 --- Could you tell me_____ ? ---- Certanily. In half an hour.
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A
when will the high speed train arrive
B
when the high speed train will arrive
C
when would the high speed train arrive
D
when the high speed train would arrive
Her life ________ a lot during the last three years.
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A
changed
B
changing
C
has changed
D
will change
Do you know when the basketball_________?
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A
is invented
B
was invented
C
has invented
D
had invented