“many+a+单数名词” 后面接单数动词，这是一个习语形式，通常用于书面语或诗歌中，要比“many+复数名词”强调。

例如：

Many a man has (=Many men have) tried this experiment before.

Many a customer comes or goes (=Many customers come or go).

Almer has been there many a time (=many times). 

[分析] 句中的主语reason系单数，用单数动词，故 A 错，应are改写为 is。

I met him _____ in the bus.

A. many a time

B. many a times

C. many time

 

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