________there are a large number of chemical factories, the air is likely to be polluted.
#68049
A
Where
B
That    
C
Though
D
As
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They have no idea at all  ________. 
#68950
A
where has he gone
B
where did he go
C
which place he has gone
D
where he has gone
On the table she found a piece of paper _______ some confusing symbols.
#73639
A
which was written
B
that was written
C
on which were written
D
on that was written