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Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of th
Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of th
admin
2011-05-29
40
问题
Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of their time.
选项
A、narrow down
B、boil down
C、tone down
D、let down
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/Et6O777K
0
考博英语
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