There are fifty students in this class， ________ of them are boys，so the number of the boys is 30．（ ）
| A． |
three fifth |
| B． |
three fifths |
| C． |
three five |
There are fifty students in this class， ________ of them are boys，so the number of the boys is 30．（ ）
| A． |
three fifth |
| B． |
three fifths |
| C． |
three five |
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