单项选择题

In the experiment we kept a watchful eye ______ the developments and recorded every detail.

A. in
B. at
C. for
D. on
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单项选择题
Most children in Great Britain are educated at the public ______
A. cost
B. payment
C. expense
D. charge
单项选择题
The rain was heavy and ______ the land was flooded.
A. consequently
B. continuously
C. consistently
D. constantly
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