David had prepared carefully for the chemistry exam, as he wanted to be sure of passing it at the first _____.

A. experiment B. intention C. aim D. attempt

 

D

【解析】

試題分析：考查名詞辨析。句意：大衛(wèi)已經(jīng)為化學(xué)考試做了精心準(zhǔn)備，因為他想確定第一次嘗試就通過。A實驗；B意圖，目的，打算；C目標(biāo)，目的；D嘗試，企圖�！盎瘜W(xué)考試”不是一次實驗，排除A；B、C兩項在此與句意不符；at the first attempt初次嘗試，故選D。

考點：考查名詞辨析

 

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