13．Three fifths of the land in that district ______covered with trees and grass in the past．（　�。�
A．isB．areC．wasD．were

分析 在過去，那個地區(qū)有五分之三的陸地被樹和草所覆蓋．

解答 答案：C．
根據(jù)時間狀語in the past結(jié)合語境推測句意是"在過去，那個地區(qū)有五分之三的陸地被樹和草所覆蓋．"句子表述的是過去的事情，所以用一般過去時；再根據(jù)主語Three fifths of the land 是不可數(shù)名詞（分數(shù)修飾名詞時，由所修飾的名詞決定單復(fù)數(shù)），所以 be動詞用was．故選C

點評 關(guān)于主謂一致有很多種規(guī)則，比如就近原則等等，平時的學(xué)習(xí)中一定要掌握好規(guī)律，多多歸納總結(jié)，以防混淆．

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