We planted          trees last year.
A．hundreds ofB．hundred ofC．five hundredsD．five hundred of
A
hundred、thousand、million等數(shù)詞與具體數(shù)字連用時(shí)，用單數(shù)形式，后面不加-s；若與of連用表示約數(shù)時(shí)，后面必須加-s，且不可與數(shù)詞連用。hundreds of意為“成百上千的”，故選A。
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