_______ 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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