填空题

It is already the (know) ______ fact that we are developing at a fast speed.

【参考答案】

known
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A．86762324B．68763324C．86763324D．68762324
A．86762324
B．68763324
C．86763324
D．68762324
填空题
In my opinion, it is important that the water (clean) ______before we use it.
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