【題目】A landmark(里程碑) in the history of science was made by a photo _______ was taken on April 10th about the black hole in a faraway galaxy(星系).

A. whoB. whichC. whatD. when

【答案】B

【解析】

句意：4月10日，一張被拍攝的遙遠星系黑洞的照片，是科學史上的一個里程碑。本題考查定語從句。A. who誰；B. which哪個；C. what什么；D. when什么時候。選項C. what不能用來引導定語從句，排除；本題的先行詞是a photo，名詞，因此用引導詞which來引導。故選B。

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