单项选择题

We always keep （） spare paper, in case we run out.

A. too much
B. a number of
C. plenty of
D. a good many

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单项选择题
I soon found that the work I was doing had already been done by someone else— （）, I was wasting my time.

A. in fact
B. in other words
C. in a word
D. as a result
单项选择题
Every year a lot of life species die （）.

A. out
B. away
C. of
D. from
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