During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates ____ beside to see what would happen. 
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A
were standing
B
stood
C
standing
D
to stand
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The discovery of new evidence led to__________
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A
the thief having caught
B
catch the thief
C
the thief being caught
D
the thief to be caught
We are invited to a party _________in  our club next Friday.  
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A
to be held
B
held
C
being held
D
holding