__________ it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal.
A．WhileB．AsC．WhenD．Before
A

試題分析：考查連詞，A. as當…時候B. until直到…C. while當…時候D. when當…時候，before主要引導(dǎo)時間狀語從句，意為“先于”“…之后才”“(不多久)就…”。當主句是將來時時，從句謂語動詞須用現(xiàn)在時；當主句是一般過去時或過去完成時時，從句常用過去時。before引導(dǎo)的時間狀語從句不能用于否定式，when所引導(dǎo)的從句，其謂語動詞即可是持續(xù)動詞，也可是短暫動詞；謂語動詞動作發(fā)生的時間可以與主句謂語動詞的動作是同時、或之前、之后；while句中的謂語動詞是持續(xù)動詞，不用短暫動詞，位于動作發(fā)生的時間通常與主句謂語動詞動作發(fā)生時間是同時；as側(cè)重指從句的動作與主句的動作同時進行，謂語動詞可以是持續(xù)性動詞，也可以是短暫性動詞，所以選A
點評：連詞是高考�？純�(nèi)容，本題不同的詞意思相同，但是它們有區(qū)別，要求考生掌握它們的區(qū)別
即學(xué)即練：He was about to make a call to Tom _____ Tom patted me on the shoulder.
A. as       B. until        C. while         D. when
選D
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