单项选择题

（）the compass was first made in China

A. It is known to all
B. It is known that
C. We all know
D. As is known to all

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单项选择题
{There is no rush now, for the game has been （）

A．taken off
B．made out
C．called off
D．switched
单项选择题
He is said to （） the old couple for more than ten years.

A．have looking after
B．be looking after
C．look for
D．have been looking after
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