单项选择题

I won’t forget the day （） I met him.

A.which
B.where
C.what
D.when

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单项选择题

No one （） his sadness.

A.appeared to be noticed
B.appeared to have noticed
C.appear to notice
D.appeared to notice

单项选择题

You can ask questions about any detail （） to this meeting.

A.relate
B.to relate
C.relating
D.relates