5．-Tom seems not so enthusiastic as he was two years ago．
-Yes．He's really reached a point in his career ______ he has to decide what to do next．（　�。�
A．thatB．whenC．whereD．which

分析 -湯姆似乎沒(méi)有兩年前那么熱情了．
-是的，他的事業(yè)真的到了必須決定下一步該做什么的關(guān)頭了．

解答 答案：C
本句是定語(yǔ)從句；先行詞是a point，由于該從句中缺少狀語(yǔ)，指的是"at a point在某種關(guān)頭"；故用關(guān)系副詞where，故選C．

點(diǎn)評(píng) 做本題時(shí)，需要掌握定語(yǔ)從句的結(jié)構(gòu)特點(diǎn)以及關(guān)系副詞where的用法；
1．where 主要用于修飾表示地點(diǎn)的名詞/代詞，在定語(yǔ)從句中用作地點(diǎn)狀語(yǔ)，
如：This is the village where he was born．這就是他出生的村子．
      That's the hotel where we were staying last summer．這就是我們?nèi)ツ晗奶熳〉穆灭^．
2．where有時(shí)還可用于抽象名詞后引導(dǎo)定語(yǔ)從句，并在該從句中作狀語(yǔ)；
如：We have reached a point where a change is needed．我們到了必須改一改的地步．
       There are cases where the word"mighty"is used as an adverb．在一些情況下，mighty一詞可用作副詞．

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