The scientist has made quite a few discoveries, ______ of great importance to the whole world.
A．which I think they areB．which I think are
C．I think which areD．that I think they are
B
此題考查非限定性定語從句。非限定性定語從句不能用關(guān)系代詞that來引導(dǎo)，因而排除D.項；[C]項語序不對；在以Which開頭的[A]、B.項中，關(guān)鍵要識別出插入語“I think”，這樣顯然[A]項中的they為多余的詞，因此B.項為正確答案。
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