We always keep gas in case we run out.
A. a great number of
B. plenty of
C. much too
D. a good many
网友回答
A. a great number of
(答案→)B. plenty of
C. much too
D. a good many
解析： 句意：我们总是保持足够的天然气以免用完。a great number of修饰可数名词复数；plenty of既能修饰可数名词又能修饰不可数名词；much too 过分，太；a good many修饰可数名词复数。因为gas是不可数名词，所以选B。