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（ ） Bicycle became a practical means of transportation __________ many improvements were made. 查看材料
A
before
B
when
C
as soon as
D
after
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参考答案
试题答案：
D
答案解释：
D【解析】从第三段第三句中的“after many?improvements being made”可知应选after。
相关题目
In American society, young people often __________. 查看材料
Coconut(椰子)is an unusual food for many reasons.It is one of the largest edible seeds produced by any plant.Its unusual contents also make it unique in the seed world—it consists of both “meat“ and “water” inside.The coconut meat is the white substance with which we are all familiar，as it is used extensively for cooking and flavorings;the coconut water is a white and sweet liquid.Portuguese(葡萄牙的) explorers gave the nut its name in the l5th century, referring to it as coco，meaning “ghost” in their language.The outside appearance of coconuts reminded them of a ghost’s face，and the tree has had that name ever since. The coconut has varied uses.It is used to make various cooking oils for fast food restaurants around the world to make diet materials.The coconut fluid is a favorite drink in hot climates，providing a cool and refreshing beverage right off the tree.This water is also used by manufacturers of various sports drinks.Even the shell itself has many uses，including animal food and fertilizer. And all these are only some of the uses found for the coconut fruit.The coconut tree， which produces the nut，also produces many useful things.It’s no wonder that the coconut tree has been taken as “the tree of life”.
第30答案是（ ） 查看材料
—She‘s broken her arm again. —Again? I ______ she _______ ever broken it before.
Your sister used to visit you quite often, __?
A.mustn'tB.couldn'tC.needn'tD.shouldn't
第33答案是（ ） 查看材料
He took the machine to pieces to find out how it _______.A. progressed B. operated C. equipped D. managed
Pick me up at eight o'clock, I __ my bath by then.
They started off at about 5 o’clock in the morning. They should ____ there by now.A. arrive B. have been arriving C. have arrived D. be arriving
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