–Mr Li, I found a watch on the playground.-You should try to find out ______.
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A
whose is the watch
B
who is the owner of the watch
C
whom does the watch belong to
D
who the owner of the watch is
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I know a place________we can have a big meal. 
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A
that
B
where
C
which
D
what
—What did he say just now?   —He wondered___________________.
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A
when he can join us
B
that he could join us
C
when could he join us
D
whether he could join us or not