74.A1972 agreement between Canada and the United States reduced the acmount of phosphates that municipalities had been allowed to dump into the Great Lakes A. reduced the acmount of phosphates that municipalities had been allowed to dump D. reduced the acmount of phosphates that municipalities are allowed to dump 答案是D，我觉得原句的时态也可以说得通的，可以将municipalities had been allowed to dump理解成agreement的内容，就是说原来允许dump,但是现在不会了，从而可以减少phosphates
78. Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles Islands. A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of D. sloth, found in PUerto Roco in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on 答案是D, 理由是made it the earliest...中的it没有singular antecedent.但是it不是代表sloth吗？？
85. Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization that flourished at the same time as the civilizations in the Nile Delta and the river valleys of the Tigris and Euphrates. A.that flourished at the same time as the civilizations 原句是对的，我想问一下为什么后面没有did啊，就是the site of an ancient civilization that flourished at the same time as the civilizations did in the Nile Delta and the river valleys of the Tigris and Euphrates.
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发表于 2009-8-16 22:11:00
