17． is no doubt  Tu Yoyo，the 2015Nobel Prize winner in Medicine，ever did so much on her way to success．（　　）
A．It；whetherB．There；thatC．There；whetherD．There；if

分析 毫無疑問，屠呦呦，2015年諾貝爾醫(yī)學(xué)獎(jiǎng)的得主，在通向成功的路上付出了那么多．

解答 答案：B．
分析句子結(jié)構(gòu)可知，本句考查句型there is no doubt that…，其中that引導(dǎo)的為一同位語從句，是對所修飾名詞doubt的解釋說明；故答案為B．

點(diǎn)評 本題考查同位語從句，注意區(qū)分其與定語從句，定語從句前面的名詞即先行詞在后面定語從句中需充當(dāng)成分，而同位語從句是對前面名詞的補(bǔ)充說明．

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