问题: 三、选择
9、No one knows _____ .
A.when are they going to leave
B.when they are going to leave
C.when do they leave
D.when did they leave
解答:
9、No one knows __B___ .
A.when are they going to leave
B.when they are going to leave
C.when do they leave
D.when did they leave
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