单项选择题

Some people consider ______ cruel to send animals in rockets into space.

A．that is
B．it being
C．it be
D．it
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单项选择题
There is no point ______ it again to him, for he never listens to our advice.
A．saying
B．to say
C．say
D．said
单项选择题
By the time I return, you ______ this book.
A．would finish
B．should have finished
C．would have finished
D．will be finished
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