【C16】A．regularlyB．oftenC．usuallyD．always

To make their miles count, members must______.A．pay their membership fees regularlyB．fly o

【C12】A．seldomB．sometimesC．usuallyD．never

A．neverB．oftenC．everD．now

A．regularB．oftenC．usualD．incidental

材料题请点击右侧查看材料问题 查看材料A.neverB.oftenC.ev

【C11】A．alwaysB．oftenC．sometimesD．never