问题描述:
选择题:They had ( ) hard time ( )weight.(急,在线等)
A.a,in
B./,lose
C.a,lose
D.a,losing
请说明原因,谢谢了~~
A.a,in
B./,lose
C.a,lose
D.a,losing
请说明原因,谢谢了~~
问题解答:
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