答案是in which
題目中的定語(yǔ)從句為“ _________ the young men competed ”,compete in sth是個(gè)詞組,句子常規(guī)狀態(tài)下的語(yǔ)序應(yīng)該是the young men competed in which,定語(yǔ)從句把 in which移到了被修飾的詞（the ones）后面了
有區(qū)別,which是關(guān)系代詞,where是關(guān)系副詞.一般說來,當(dāng)引導(dǎo)定語(yǔ)從句時(shí),where等于介詞+which,如：This is the place ( ) I was born.在這句話中,既可以填in which也可以填where.當(dāng)然介詞不一定是in,有可能是on或其他的,這個(gè)要根據(jù)先行詞來.比如,如果是bus,平時(shí)搭配是on the bus,換成定從,就是on which.
此外,介詞+which也可表示時(shí)間,相當(dāng)于when,如：Do you still remember the year when(in which) we lived together?
還是不懂的話可以發(fā)我消息,具體給你講解能舉一個(gè)用where不用介詞+ which的例子嗎？定語(yǔ)從句如果作為表地點(diǎn)的狀語(yǔ)的，這2者是一樣的，可以通用。作為主語(yǔ)或者賓語(yǔ)的時(shí)候用的是which而不是in which。比如： He went back to NY,in which he had spent all his childhood.= He went back to NY,where he had spent all his childhood. 他回到了紐約，他在那度過了整個(gè)童年。(先行詞在從句中作地點(diǎn)狀語(yǔ)。當(dāng)然in which中的in可以根據(jù)實(shí)際需要換成at、on等 )He goes to NY,which is a beautiful city. 他去紐約了，那是一個(gè)美麗的城市。（先行詞在從句中作主語(yǔ)。）樓主的題目中先行詞不是做狀語(yǔ)，而是做賓語(yǔ)，所以不能用where