Question

__________ 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．While

B．As

C．When

D．Before

Answer 1

A

試題分析：考查連詞，A. as當(dāng)…時(shí)候B. until直到…C. while當(dāng)…時(shí)候D. when當(dāng)…時(shí)候，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，when所引導(dǎo)的從句，其謂語動(dòng)詞即可是持續(xù)動(dòng)詞，也可是短暫動(dòng)詞；謂語動(dòng)詞動(dòng)作發(fā)生的時(shí)間可以與主句謂語動(dòng)詞的動(dòng)作是同時(shí)、或之前、之后；while句中的謂語動(dòng)詞是持續(xù)動(dòng)詞，不用短暫動(dòng)詞，位于動(dòng)作發(fā)生的時(shí)間通常與主句謂語動(dòng)詞動(dòng)作發(fā)生時(shí)間是同時(shí)；as側(cè)重指從句的動(dòng)作與主句的動(dòng)作同時(shí)進(jìn)行，謂語動(dòng)詞可以是持續(xù)性動(dòng)詞，也可以是短暫性動(dòng)詞，所以選A
點(diǎn)評(píng)：連詞是高考常考內(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