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A number of students        trees every year and the number of them        increasing.
A．plant; isB．plants; isC．planting; isD．planting; are
A
本題考查number of的用法。a number of為量詞短語，表示“許多……”，中心詞是這個短語所修飾的復數(shù)名詞，所以作主語時，謂語動詞用復數(shù)形式。the number of表示“……的數(shù)量”，后接復數(shù)名詞，其中，中心詞為number，因此謂語動詞用單數(shù)。
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