请教 Prep语法 155， 153题

nicole_jiang

With surface temperatures estimated at minus 230 degrees Fahrenheit, Jupiter's moon Europa has long been considered far too cold to support life, and with 60 square miles of water thought to be frozen from top to bottom.
A.    Europa has long been considered far too cold to support life, and with
B.    Europa has long been considered far too cold to support life, its
C.    Europa has long been considered as far too cold to support life and has
D.    Europa, long considered as far too cold to support life, and its     （B）
E.    Europa, long considered to be far too cold to support life, and to have


这是一个什么结构？


153. For centuries, people on sea voyages washed their clothes by placing the dirty laundry in a strong cloth bag, then toss it overboard, and let the ship drag the bag for hours.

A.then toss it overboard, and let

B.then toss them overboard, and they let

C.tossingitoverboard, and letting

D.tossing them overboard, and let(C)

E.tossing it overboard, and let

虽然不是这道题目的考点，但是这里的it没有指代的模糊吗？（dirty laundry or cloth bag)

wuzongde

先说153题，it指代laundry，没有模糊。因为前文placing THE dirty laundry，而且后面letting ...THE BAG也表明了前面的指代关系。
155题，答案应该是C吧？同问盼解。