China has         in producing clones of cows and goats, and continues to research ways          _______ can benefit mankind.
A．resulted ; thatB．succeeded ; /
C．succeeded ; thatD．resulted ; in which
A

試題分析：result in 結(jié)果是---，以---為結(jié)果；succeed in 在某方面取得成功。由后面的繼續(xù)研究可知，這只是階段性的結(jié)果，并非成功，故應(yīng)為result in。第二個空是定語從句，先行詞為ways,而定語從句缺少主語，故應(yīng)為that,且不能省略。句意為：中國產(chǎn)生出了科隆牛和科隆羊，繼續(xù)研究有益于人類的方法。
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