More than one example______necessary to make the students understand this rule clearly.

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问题 More than one example______necessary to make the students understand this rule clearly.

选项 A、should be
B、is
C、are
D、have been

答案B

解析 many a(许多)+单数可数名词或more than one(不止一个)+单数可数名词作主语对,常遵循“语法一致”的原则,即主语是单数,谓语也用单数。
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