___number of policeman are looking for a lost boy.

___number of policeman are looking for a lost boy.
___number of policeman are looking for a lost boy.

___number of policeman are looking for a lost boy.
a number of 大量的,许多,the number of ……的数量,此题填a ,因为后面的动词用了are

a lot

A number of 许多。。。。 修饰可数名词


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A number of 很多