②强调it无意义，that / who不是引导词。
③强调it is / was和that / who后如果句子意思讲得通则是强调句，讲不通则不是。
It is the museum that / which we visited last year.(定语从句)
It was in the hotel that we stayed last night.（强调句）
Word came that their army was defeated.(同位语)
We expressed to them our wish that was the same as their.(定语)
①He is the only one of the students who has got very good marks in the match.（句中one为先行词）
He is one of the students who have got good marks in the match.（句中students为先行词）
②Is this place the one (that) we visited yesterday?
Is this the place(that / which)we visited yesterday ?
③He stood at the window, from where he could see what was happening.
④It may rain, in which case the match will be put off.