13．-When do you need to pay off your tuition？
-______ July 30，2013．（　�。�
A．OnB．ByC．InD．During

分析 ---你需要什么時候付清你的學費？---2013年7月30號之前．

解答 答案B．A項"指在具體某一天"；C項"指一個籠統(tǒng)的時間，即in不可以具體到某一天"不符題意可排除；D項"指時間段"，回答‘July 30，2013'是時間點可排除；B項"在…之前；到…末為止"；‘by+時間'指"最遲在…之前""到…的時候已經(jīng)…"；根據(jù)上下句的語境可判斷，說話者是想問繳清學費的截止日期，因此回答應表示‘最遲在2013年7月30號之前付清，即2013年7月30號之前已經(jīng)付清學費了'，因此B項符合語境，故選B．

點評 本題考查介詞辨析．解答此類題目首先要讀懂句意，理解每個選項介詞的意思，然后根據(jù)上下文語境鎖定合適的介詞．平時要加強介詞的積累．

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