--Haven't you seen Mr. Wilson at the lecture?
--Yes, but he had left _________ I could ask him any questions.
A．whenB．beforeC．a(chǎn)fterD．a(chǎn)s
B

試題分析：考查引導詞的用法，when 意思“當……時候”，所引導的從句，謂語動詞可以是持續(xù)的，也可以是短暫性動詞，謂語動詞發(fā)生的時間可以與主句謂語動詞的動作是同時的，before意思“在……之前”， after意思“在……之后”，as意思“當……時候”，側(cè)重指從句與主句的動作同時進行，謂語動詞可以是持續(xù)的，也可以是短暫性動詞，句子意思“我將要問問題他就離開了”，所以選B
點評：引導詞是�？純�(nèi)容，要知道它們的用法，when 意思“當……時候”，所引導的從句，謂語動詞可以是持續(xù)的，也可以是短暫性動詞，謂語動詞發(fā)生的時間可以與主句謂語動詞的動作是同時的，before意思“在……之前”， after意思“在……之后”，as意思“當……時候”，側(cè)重指從句與主句的動作同時進行，謂語動詞可以是持續(xù)的，也可以是短暫性動詞.
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