单项选择题

Children who stay away from school do（）for different reasons.

A．them
B．/
C．it
D．theirs

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单项选择题
The student said there were a few points in the essay he（）impossible to comprehend.

A．had found
B．finds
C．has found
D．would find
单项选择题
For some time now, world leaders （） out the necessity for agreement on arms reduction.

A．had been pointing
B．have been pointing
C．were pointing
D．pointed
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