题目内容
2．If you miss this chance，it may be years __________ you get another one．（ ）| A． | As | B． | before | C． | since | D． | after |
分析 如果你错过这次机会，可能要等几年才会再有．
解答 as 因为，before之前，since由于，after之后．根据易混淆的两个句型，It is/has been+时间段+since sb did sth某个动作发生持续多久，和it be+时间段+before..表示要多久后才会．结合句子逻辑可知答案应选B
点评 考查从属连词的习惯性用法
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