There are many ()mountain怎么做

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“many a＋单数可数名词”形式上为单数,但意义上为复数(意为“许多”),若用作主语,其谓语通常与形式一致而不与意义一致(即谓语用单数).如：
Many a student has seen the film.许多学生看过这部电影.
Many a fine man has died in that battle.许多优秀的士兵死于那次战役.
Many a ship has been wrecked on those rocks.许多船只毁于那些礁石之上.
Many a young man has tried and failed.很多年轻人都试过,而且失败了.
======以下答案可供参考======
供参考答案1:
可能填a 吧many a 是许多的意思，（不过后面要加单数）