摘要：28．It never occurred to humans until the mid-1990s some animals can be cloned． A．where B．that C．when D．what
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It never occurred to humans until the mid-1990s _____ some animals can be cloned．
A．where B．that C．when D．what
查看习题详情和答案>>It never occurred to humans until the mid-1990s ________ some animals can be cloned．
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A．
where
B．
when
C．
that
D．
what
It never occurred to humans until the mid1990s ________ some animals can be cloned.
A．where B．that C．which D．what
查看习题详情和答案>>It never _____ humans until the mid1990s that some animals can be cloned.
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A．occur |
B．is occurred |
C．occurred to |
D．occurred |
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