这题既不是选B 也不是选D,正确的是选A
因为,首先,这是现在完成时,yet 是现在完成时的提示词,但是也可以是一般现在时
第二,When and why he came here 这个整个句子做主语,凡是句子做主语的,都是单数,因此是IS
第三,这是被动,他何时来为什么来,还尚未为人所知悉
如果是现在完成时,是has not been known
When and why he came here ________ yet.选什么
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