语法问题 谢谢帮忙

1． In jazz music, a riff is a simple melodic figure, _________ and repeated several times.
(A) usually one or two measures lasted
(B) lasted one measure or two usually
(C) is lasting one or two measures usually
(D) usually lasting one or two measures

不太明白 D 为什么错

如果A对那D一定对。

【必读】语法区第一贴 －《语法区版规》提问格式说明

cd小兵

xiexie