There has beenrising demand for grain asindustrial material in spite of the nation’s good harvests.

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问题 There has been______rising demand for grain as______industrial material in spite of the nation’s good harvests.

选项 A、/ ;an
B、a; an
C、the;an
D、a; /

答案B

解析辅音开头的单数名词，泛指时，前面+“a”；元音开头的单数名词，泛指时，前面+“an”。

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