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 Itneveroccurredtohumansuntilthemid­1990s

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问题详情:

 Itneveroccurredtohumansuntilthemid­1990s

 It never occurred to humans until the mid­1990s ________ some animals can be cloned.

A.where             B.that                    C.which          D.what

【回答】

B

知识点:连词

题型:选择题

标签:1990s