Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.

A．a(chǎn)fter             B．before            C．since             D．when

 

【答案】

B

【解析】

試題分析：after在……之后；before在……之前；since自……以來；when當(dāng)……時(shí)候。

句意：錢學(xué)森在他發(fā)現(xiàn)航天技術(shù)之前，他嘗試了許多次。

考點(diǎn)：考查連詞的用法。

點(diǎn)評(píng)：本試題難度適中。判斷從句中用哪個(gè)連詞，需用記住連詞的用法，在句中的作用，連詞也是高考的熱點(diǎn)，需要考生平時(shí)多練習(xí)。需要考生會(huì)分析句子成分理解句意。

即學(xué)即練：They stood respectfully ______he entered the room.

A. after           B. before          C. since        D. when

解析：D。句意：當(dāng)他走進(jìn)房間時(shí)，他們都恭恭敬敬地站著。

 

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