One?third of the area__________covered with green trees.About seventy percent of the trees
__________been planted.?
A．a(chǎn)re; haveB．is; hasC．is; haveD．a(chǎn)re; has
C?
“分?jǐn)?shù)或百分?jǐn)?shù)+of the+名詞或代詞”作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞的單、復(fù)數(shù)形式取決于名詞或代詞的單、復(fù)數(shù)形式。?
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