He was about to make a call to Tom _____ Tom patted me on the shoulder.
A．a(chǎn)sB．untilC．whileD．when
D

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，句子意思“當(dāng)湯姆拍我的肩膀的時(shí)候他將要給湯姆打電話”，所以選D，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
點(diǎn)評(píng)：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：We need some more facts and figures __________ we take the final decision.
A. since           B. before            C. after            D. until
選B
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