給你編個號：
1、Sep 18 1937 is the day ___ we will never forget.
本句定語從句,that在從句作賓語,即forget的賓語,做賓語的關(guān)系代詞通常省略.
2、Isthis factory ___ we visited last year?
加上the one,是作定語從句的先行詞 其實本該有that或which跟在the one后面的,道理和第一題一樣,做賓語的關(guān)系代詞省掉了.還原為陳述句看看：This factory is the one (that/which) we visited last year.
3、This is the factory ___ we visited last year.
這一句和我上面打的陳述句比比看,這里the factory自身就是先行詞,所以可填which或that作從句里的賓語,或者省略不填.
4、Mr.Herpin is one of the foreign experts who ＿＿ in China
A works B is working C are working D has been woking
選C,這種情況,先行詞應(yīng)認為是就近的the foreign experts,所以謂語用復(fù)數(shù),其余選項均是單數(shù).
5、Mr.Smith is the only one of those foreiners who ＿＿ inChina.
A work B is working C are working D have been working
選B.此時因為one被only所修飾,故此句的先行詞要認為是the only one,自然從句里的謂語要用單數(shù),只有B是單數(shù),其余均是復(fù)數(shù).怎樣判斷先行詞是不是賓語呢？把關(guān)系代詞放到從句里看，它在從句里是做成分的。這時候就是句子本身的成分分析了。比如：I like the skirt (that/which) my mother bought for me.這里的關(guān)系代詞that或which是動詞bought的賓語，同時它指代的是之前的the skirt。分開就是: My mother bought the skirt for me.I like the skirt.