问题
选择题
It never occurred to humans until the mid1990s ________ some animals can be cloned. [ ]
A . where
B. that
C. which
D. what
答案
答案：B
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It never occurred to humans until the mid1990s ________ some animals can be cloned. [ ]
A . where
B. that
C. which
D. what
答案：B
