Eating is difficult on __space station because there is no gravity in __outer space.

Eating is difficult on __space station because there is no gravity in __outer space.

题目
Eating is difficult on __space station because there is no gravity in __outer space.
A.the;an B.the;the; C./;the D.the;/
答案
D
第一个the特指那个space station,后面不填,in outer space外层空间
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