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【单选题】
— Oh, that's just my missing pen . Where on earth was it? — It off the table into the corner. [      ]
A.
has fallen
B.
fell
C.
falls
D.
was falling
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advice
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advise
C.
advisable
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C.
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D.
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【单选题】_________ the internet is _________, I do not think it is a good idea to spend too much time on it.
A.
When ; helpful
B.
As ; great help
C.
While ; of great help
D.
Now ; of no help
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【单选题】We should take ____ active part in the battle to stop the germs.
A.
the              
B.
an              
C.
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【单选题】()the weather is concerned, I do not think it matters.
A.
So long as
B.
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