15．The spring outing really relaxed us a lot．That is      its value lies．（　�。�
A．whatB．howC．whyD．where

分析 春游真的讓我們放松了不少，這也正是它的價值所在．

解答 答案：D 題干中its value lies是作系動詞的表語，是一個表語從句；從句中l(wèi)ie是不及物動詞，要用連接副詞；how表示方式，why表示原因，where表示地點；句意表達的是地點，故選D．

點評 在句子中起名詞作用的各種從句統(tǒng)稱為名詞性從句．根據(jù)它們在句中的語法作用，這類從句又可分為主語從句、同位語從句、表語從句和賓語從句．

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