--Haven't you seen Mr. Wilson at the lecture?
--Yes, but he had left _________ I could ask him any questions.
| A．when | B．before | C．a(chǎn)fter | D．a(chǎn)s |
試題分析：考查引導(dǎo)詞的用法，when 意思“當(dāng)……時(shí)候”，所引導(dǎo)的從句，謂語(yǔ)動(dòng)詞可以是持續(xù)的，也可以是短暫性動(dòng)詞，謂語(yǔ)動(dòng)詞發(fā)生的時(shí)間可以與主句謂語(yǔ)動(dòng)詞的動(dòng)作是同時(shí)的，before意思“在……之前”， after意思“在……之后”，as意思“當(dāng)……時(shí)候”，側(cè)重指從句與主句的動(dòng)作同時(shí)進(jìn)行，謂語(yǔ)動(dòng)詞可以是持續(xù)的，也可以是短暫性動(dòng)詞，句子意思“我將要問(wèn)問(wèn)題他就離開(kāi)了”，所以選B
點(diǎn)評(píng)：引導(dǎo)詞是�？純�(nèi)容，要知道它們的用法，when 意思“當(dāng)……時(shí)候”，所引導(dǎo)的從句，謂語(yǔ)動(dòng)詞可以是持續(xù)的，也可以是短暫性動(dòng)詞，謂語(yǔ)動(dòng)詞發(fā)生的時(shí)間可以與主句謂語(yǔ)動(dòng)詞的動(dòng)作是同時(shí)的，before意思“在……之前”， after意思“在……之后”，as意思“當(dāng)……時(shí)候”，側(cè)重指從句與主句的動(dòng)作同時(shí)進(jìn)行，謂語(yǔ)動(dòng)詞可以是持續(xù)的，也可以是短暫性動(dòng)詞.
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