It never _____ humans until the mid199...

It never _____ humans until the mid1990s that some animals can be cloned.

A．occur

B．is occurred

C．occurred to

D．occurred

C 【解析】试题分析：It occurs to sb that 某人突然想到...，occur to 发生，突然想到。。。句意：直到20世纪中期人类才突然想到克隆出一些动物。考点：考查句型It occurs to sb that

考点分析：

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试题属性

It never _____ humans until the mid­199...