单项选择题

The machine is such ______ I have never seen before.

A. that
B. as
C. which
D. where
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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
单项选择题
Because of my poor Spanish, I'm afraid I can't make myself ______.
A. understand
B. to understand
C. understanding
D. understood
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