求助一道GMAT语法题~Astronmers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.(A) that they believe is(B) that they believe it to be (C) they believe that

请教一道GMAT语法题 GMAT的一道题, 2011GMAT语法全解：GMAT语法题如何复习 GMAT语法题如何复习 求助一道GMAT语法题~Tropical bats play important roles in the rain forest ecosystem,aiding in the dispersal of cashew,date,and figseeds; pollinating banana,breadfruit,and mango trees; and indirectly help produce tequila by pollinating agaveplan 求助一道GMAT语法题A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.A.claims suggest that the economy might not be as weak as some analysts prev 求助一道GMAT语法题~Astronmers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.(A) that they believe is(B) that they believe it to be (C) they believe that 求助GMAT一道语法题According to a 1996 survey by the National Association of College and University Business Officers,more than three times as many independent institutions of higher education charge tuition and fees of under $8,000 a year than GMAT OG 语法SC132 一道逻辑题求助 求助一道几何题? 求助一道线性代数题 求助,救命一道题 GMAT OG13 SC语法第34题怎么做? GMAT一道数学题, 一道GMAT的数学题 GMAT语法全解怎么样 求GMAT语法备考经验