单项选择题

She ______ on this essay for twenty minutes but she has written only about a hundred words.

A．will be working
B．worked
C．has been working
D．will have worked
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单项选择题
Do you know the singer and dancer who ______ at the gate
A．is standing
B．are standing
C．is stand
D．standing
单项选择题
You're standing too near the camer
A．Can you move ______ A. a bit farB. a little fartherC. a bit of fartherD. a little far
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