.It’s about a time there were black slaves in North America.A. whereB. whenC. howD. that

发布时间：2020-08-16 11:12:55


.It’s about a time      there were black slaves in North America.
A. where
B. when
C. how
D. that

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A. where
(答案→)B. when
C. how
D. that
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