单项选择题

I have given up trying to convince him; there is no point ______ with him.

A. on arguing
B. in arguing
C. to argue
D. for arguing
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单项选择题
The machine is such ______ I have never seen before.
A. that
B. as
C. which
D. where
单项选择题
With five hungry children seated round the table, the food disappeared ______.
A. at no time
B. at a time
C. at other times
D. at one time or another
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