_____________, 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.
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