题目内容
There are over 58, 000 rocky objects in _____ space, about 900 of which could fall down onto _____ earth.
[ ]
A. the; the
B. 不填; the
C. the; 不填
D. a; the
B. 不填; the
C. the; 不填
D. a; the
B
练习册系列答案
相关题目
题目内容
[ ]