( )17.Nobody knows which factory _____.A he works B he works in有人说加in,有人说不加in

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( )17.Nobody knows which factory _____.A he works B he works in有人说加in,有人说不加in
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( )17.Nobody knows which factory _____.A he works B he works in有人说加in,有人说不加in
( )17.Nobody knows which factory _____.A he works B he works in
有人说加in,有人说不加in

( )17.Nobody knows which factory _____.A he works B he works in有人说加in,有人说不加in
为你提供精确解答
必须有in的存在.
in放在最后,或者放在which前都是对的.
当放在后面的时候which可以替换为that
但是如果放在前面,就不可以.

答案选B he works in
【解析】需要加in,因为work为不及物动词

Nobody knows which factory he works in。
work后面应该加in,因为,这里in作为介词是用来针对factory的。其实,将in介词提前,放在which前面也是可以的。
这里介词in不可以省略的,就像I don't know which hotel he live【in】,这种句式里的介词是一定要有的。

加In,work是不及物动词。

答案为B。
调整语序为:
Nobody knows he works in which factory.
可见,必须有介词in。