19．-How long will it be _____ the professor makes another visit to China？
-It all depends．（　�。�
A．untilB．beforeC．sinceD．when

分析 ---在教授來中國訪問前還需多長時間？
---看情況而定．

解答 答案：B．根據(jù)選項until直到…，before在…前，since自從…，when當(dāng)…時，再結(jié)合句意，在教授來中國訪問前還需多長時間？可知此處缺少了一個引導(dǎo)時間狀語從句的連接詞，故B正確．句型It will be 段時間+before…可翻譯為，還要多長時間才…

點評 本題考查時間狀語從句的連接詞，在充分分析句型再結(jié)合語義的基礎(chǔ)上便能選出正確答案，同時要注意其他選項的意思，

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