初二英语oneofthe_________(advantage)ofdoingexerciseisthatit'sagooswaytokeephealthy.
oneofthe_________(advantage)ofdoingexerciseisthatit'sagooswaytokeephealthy.(用括号内适当形式填空)
疑问:我填的是advantages可是答案没有加s为什么?不是前面有oneof吗?求高人详细解答.