30 % of the young trees, attacked by diseases, ________pine trees.
A．isB．a(chǎn)reC．wasD．has been
B
本題考查主謂一致，百分?jǐn)?shù)+名詞，其后的謂語動(dòng)詞與名詞保持一致，故謂語動(dòng)詞用復(fù)數(shù)。句意：遭受病害3 0%的小樹是松樹。
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