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单项选择题

George ought to have arrived_________this time.

A.during
B.on
C.in
D.by
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when the water level decreases from high to low, the bank slope stability ( )
A．decrease
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单项选择题
Our manager is not in right now. Can I_________a message
A.leave
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判断题
The adverbials “it is well known that”, “it is clear that”, “it is recognized that” and so on are unnecessary wordy expressions.
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