_______ this sentence a second time, the meaning will become clear to you.
A.If readingB.When you readC.ReadingD.Read
B

試題分析:通過分析句子結構,其中含有一個時間狀語從句,表示“當……時候”,A選項缺主語,C選項和D選項和句子主語不存在邏輯上的關系,故排除,故選B。
點評:用表示時間的連詞連接一個句子作狀語,這樣的主從復合句就是時間狀語從句。連接時間狀語從句的連接詞有:when, before, after, while, as soon as, until, since...... 這里要注意一點的是,如果主句是一般將來時,從句只能用一般現(xiàn)在時表示將來意義。
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