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(yǔ)，表示“許多……”，中心詞是這個(gè)短語(yǔ)所修飾的復(fù)數(shù)名詞，所以作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞用復(fù)數(shù)形式。the number of表示“……的數(shù)量”，后接復(fù)數(shù)名詞，其中，中心詞為number，因此謂語(yǔ)動(dòng)詞用單數(shù)。
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