John thinks it won’t be long _________ he finishes the tough work.
A．whenB．a(chǎn)fterC．sinceD．before
D

試題分析：考查連詞，since表示自從…；when當(dāng)……時(shí)候；after在…之后；時(shí)間段+ before，過了多久就……；before主要引導(dǎo)時(shí)間狀語從句，意為“先于”“…之后才”“(不多久)就…”。當(dāng)主句是將來時(shí)時(shí)，從句謂語動(dòng)詞須用現(xiàn)在時(shí)；當(dāng)主句是一般過去時(shí)或過去完成時(shí)時(shí)，從句常用過去時(shí)。before引導(dǎo)的時(shí)間狀語從句不能用于否定式。所以選D
點(diǎn)評(píng)：判斷從句中用哪個(gè)連詞，需用記住連詞的用法，在句中的作用，連詞也是高考的熱點(diǎn)，需要考生平時(shí)多練習(xí)。
即學(xué)即練：It may be a matter of months _____ it's ready.
A. as      B. while      C. after         D. before
選D
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