2. 外语
  3. The "father of waters", the Mississippi River is one of the【C1】______ in the world. According to the United States Army Corps of

The "father of waters", the Mississippi River is one of the【C1】______ in the world. According to the United States Army Corps of

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问题      The "father of waters", the Mississippi River is one of the【C1】______ in the world. According to the United States Army Corps of Engineers, if it is【C2】______  from the Upper Red Rock Reservoir which leads to its longest【C3】______  , the Missouri-the Mississippi【C4】______ 3,658 miles to the Head of Passes in the delta. From Lake Itasca in Minnesota to the Passes the Mississippi measures 2,550 miles. The upper Mississippi River is 1,401 miles long. The drainage basin, which【C5】______ from western Pennsylvania to Idaho, embraces two fifths of the continental United States, not【C6】______  Alaska. It is third in size only【C7】______  the Amazon and Congo river basins. The greater part of this vast region is enormously fertile,【C8】______ makes the Mississippi Valley an agricultural empire second to【C9】______  .
     Early Spanish explorers in the Gulf of Mexico had noted the mouth of this great river and【C10】______  it the River of the Holy Ghost. Hemando de Soto is usually considered【C11】______  He not only【C12】______ the wide muddy stream in his explorations in 1541,【C13】______  he died upon its banks and was buried in it. More than a hundred years passed【C14】______  other Europeans saw it. Then in 1673 the brave and【C15】______ Frenchmen Father Jacques Marquette and Louis Jolliet 【C16】______  it as far as the mouth of the Arkansas River. It【C17】______  for La Salle and his party, in 1682, to【C18】______ the river to the gulf. Two years earlier Louis Hennepin, sent by La Salle,【C19】______ the upper river from the mouth of the Illinois to St. Anthony Falls, the present site of Minneapolis. A hundred and fifty years【C20】______ , in 1832, Henry Schoolcraft followed the Mississippi proper to its source in several small Minnesota lakes, including Lake Itasca.
【C19】
选项 A、explored
B、had explored
C、was exploring
D、had been exploring
答案B
解析 本题考查的是语法。从前面的时间状语Two years earlier可以判断该空应该使用过去完成时态，所以选项B为本题的正确答案。
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