问题描述：
1.I will wait ( )he comes back,because I have something to tell him.
A until B before C when D while
2.What ( )exciting news it is Is ( )new true?
Aan,the B an ,a C /,the D / ,a
A until B before C when D while
2.What ( )exciting news it is Is ( )new true?
Aan,the B an ,a C /,the D / ,a
问题解答：
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