12．Researchers have come to the conclusion over the last 5years ____ teens need to sleep until about 8：00the next morning．（　�。�
A．whenB．whatC．whetherD．that

分析 研究人員在過(guò)去的5年已經(jīng)得出結(jié)論，青少年需要睡到第二天早上8：00．

解答 答案：D．根據(jù) teens need to sleep until about 8：00the next morning可知整句是對(duì)前面 the conclusion 的補(bǔ)充說(shuō)明，是同位語(yǔ)從句，不缺成分，故選D．

點(diǎn)評(píng) 本題考查同位語(yǔ)從句，在熟知同位語(yǔ)從句連接詞及充分分析句型基礎(chǔ)上便能選出正確答案．

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