【題目】Scientists think calculating is a necessary skill_________ they base their researches.
A.on it
B.on that
C.on which
D.on whose

【答案】C
【解析】句意：科學(xué)家認(rèn)為計(jì)算是一種依據(jù)他們的研究為基礎(chǔ)的必須技能。 base on....固定短語，“依據(jù)......為基礎(chǔ)”。a necessary skill做先行詞，指物，在后面的定語從句中做on的賓語，故選C。

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