单项选择题

By the time you arrive this evening, () for two hours.

A. I will study
B. I will have been studied
C. I had studied
D. I will have been studying

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单项选择题
I am disappointed with the new officers elected in our club , but there is no point ______ about it.
A. to worry

B. in worrying
C. for us worrying
D. with us to worry
单项选择题
After he worked out the solution, () appeared a smile on his face.

A. it
B. here
C. what
D. there
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