a 学生落座后,演讲者开始讲话.
b和d的逻辑主语是speaker,所以不对
c 是完整的句子,没有and 连接,也不对
_____________, the speaker began his speech. 选哪个
_____________, the speaker began his speech. 选哪个
a.the students having taken their seats.
b. having taken their seats.
c.the students have taken their seats.
d.taking their seats.
a.the students having taken their seats.
b. having taken their seats.
c.the students have taken their seats.
d.taking their seats.
英语人气：106 ℃时间：2019-12-19 02:21:57
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